Product Pricing

(You may also use these links to enter the Shopping Cart to place an order or to determine shipping cost) Product

MTC-X Mobile Tank Cleaning System - 20 GPM - 110V/60Hz

Your Price: $12254.00 Product

MTC-X Mobile Tank Cleaning System - 20 GPM - 230V/50hz

Your Price: $12254.00

Product Pricing
MTC Accessories

(You may also use these links to enter the Shopping Cart to place an order or to determine shipping cost) Product

MTC ASB - Spill Prevention Berm

Your Price: $465.00 Product

Add Optioanl LG-X 3000 to MTC-X

Your Price: $625.00

Product Pricing
Optional Products

(You may also use these links to enter the Shopping Cart to place an order or to determine shipping cost) Product

AFC-705 Diesel Fuel Catalyst -- 8-oz. Bottle

Your Price: $32.00 Product

AFC-705 Diesel Fuel Catalyst -- 1-Gallon

Your Price: $209.00 Product

AFC-710 Diesel Fuel Catalyst -- 8-oz. Bottle

Your Price: $31.00 Product

AFC-710 Diesel Fuel Catalyst -- 1-Gallon

Your Price: $204.00 Product

TS4-SS Tank Fluid Sampler, Stainless Steel - 4 oz.

Your Price: $409.00 Product

TS8-SS Tank Fluid Sampler, Stainless Steel - 8 oz.

Your Price: $462.00 Product

TS16-SS Tank Fluid Sampler, Stainless Steel - 16 oz.

Your Price: $543.00 Product

FT-100 Liqui-Cult Fuel Test Kit - Box of 10 bottles

Your Price: $142.50

Mobile Tank Cleaning Bag System

Series Tank Cleaning
Where You Need It Most

Fuel Polishing System

MTC 500 Fuel Polishing System

Click on Graphic to Enlarge

Diesel Fuel Before and After

Before and efore and after fuel cleaned by the AXI Fuel Polishing System

Click on Graphic to Enlarge

Debris and Water Removed
from the Bottom of Tank

Sediment removed with ALGAE-X

Click on Graphic to Enlarge

Mobil Tank Cleaning
System Specifications



Flow Rate

26 GPM - 1,560 GPH
(98 LPM - 5,900 LPH)
for 110v/60Hz
20 GPM - 1,200 GPH
(75.7 LPM - 4,542 LPH)
for 230V/50Hz

Fuel Treated in 8 Hours

up to 12,480 gallons
(up to 47,000 ltr)


3/4 HP SP Continuous Duty Thermally Protected, TEFC


Rotary Vane Self-priming Pump


115V / 60Hz 15A or
230V / 50Hz 15A

Max. Fluid

5 cST


Diesel Fuel, Hydraulic, Engine &
lube oil, water, antifreeze


Stainless Steel

Port Size

1 1/2" NPT Male In
1 1/4" NPT Male Out


Suction (clear) 1.5 in x 25 ft. (7.6m)
Discharge 1.25 in x 25 ft (7.6m)


1 1/2" Cam &
Groove In
1 1/4" Cam &
Groove Out

Filtration Controller


Fuel Conditioner (Optional)

AXI LG-X 3000

Primary Filtration

PF-30 HD Bag Filter

Secondary & Tertiary Filtration


Secondary** & Tertiary Filter Elements

1,3,10,25µ &3µ X-Glass Fine Filter or
3 or 10µ Water Block Filter


Powder Coated Aluminum Back Plate

Operating Temperature

41 - 104 deg. F
(5 - 40 deg C)


185 lbs (84 kg)

(H x W x D)

48" x 22.5" x 25"
(122 x 57 x 63 cm)

** Secondary Filter Standard with FF-BP Bypass Void Canister (with no media)

Not for use with fluids that have a
flash point below 100 deg. F.

Available Options for
the MTC-X Cart Mounted Mobile
Tank Cleaning Systems

Spill Protection Berm

Portable Spill Prevention Berm -- Heavy duty, portable and reusable spill prevention berms are recommended to avoid accidental fluid leakage into the environment. 48 inches X 48 inches X 6 inches - can be rolled.

Digital Flow Meter -- Shows how much fuel has been treat with the AXI Mobile Tank Cleaning System. Mount on the discharge side of the MTC unit. MTC-X would use the DM 30 Flow Meter.

Extra Suction and/or Discharge Hose -- The MTC-X Tank Cleaning System come with 25 feet of Suction and 25 feet of Discharge hose. In some instances, additional hose is needed and can be purchased by the foot. Note the above table provides information on the diameter of the hose required for the MTC-X unit you are considering. Along the left side of this page, see prices, by the foot, for additional hose.

MTC-X Extended Warranty -- AXI Standard Warranty provides protection against defects in material and workmanship for a period of one (1) year. AXI offers an extended warranty plan that can extend your coverage for one, two, three, or four additional years. Contact us for additional information.

Other Products that
Enhance the Operation of the
MTC-X System

AFC-705 Diesel Fuel Catalyst -- A POWERFUL Full Spectrum Additive and tank cleaning agent. It is a unique broad-spectrum fuel additive that provides Superior Diesel Fuel Quality for Engines and Storage Tanks, lowering operating cost, maintenance and downtime.

AFC-710 Diesel Fuel Catalyst -- A unique and powerful Tier 4 compliant broad-spectrum fuel additive concentrate for use in Diesel, Bio-fuels, Gasoline, Kerosene, and HFO.

AFC-805 Diesel Fuel Catalyst -- An effective means of decontaminating and cleaning storage tanks and stabilizing fuel fuel, ideally used for cold weather applications where there is long term fuel storage, such as bulk fuel farms, winterized recreational and work boats, and also smaller engines.

Fluid Tank Sampler -- Obtain samples from larger tanks using the AXI Stainless Steel Tank Samplers, available in 4 oz., 8 oz., and 16 oz. capacities

Fluid Sample Pump & Sample Bottles -- Use this hand pump to obtain samples of fuel. Sample is deposited directly into 4 oz. or 16 oz. bottle for further testing.

Tank Access Ports -- Easily create an access port in your fuel tank for obtaining samples or access for performing tank cleaning and fuel polishing.

Liqui-Cult Fuel Test KitsTest kits are used to detect microbial growth in fluids and determines the type and degree of infestation.

FUELSTAT® Fuel Test Kits -- Fuel Test kits for detecting microbial growth in fluids that can provide in-the-field instant test results.

Desiccant Fuel Tank Breathers -- Unlike tank installations that utilize open vents or conventional breathers, Desiccant Breathers provide a simple yet dependable defense against not only particulate contamination from entering the tank, but also moisture in the air from entering your storage or equipment tanks.

Water Eliminator -- Water Eliminator crystals are water specific and will swell many times their weight in water. Water specific means they will only absorb the water in your tank and will not absorb or adversely affect gasoline, diesel fuel, fuel oil, JP5 or hydraulic oil. Place a Water Eliminator in your fuel tank and monitor at each fill up for accumulated water.

Water Finding Paste -- Use some "Kolor Kut" paste on the end of a stick or a tank measuring rod that reaches through the top fill opening all the way to the bottom of the tank. Kolor Kut paste will show the water level in the tank by changing color where it comes in contact with water, indicating how much water and sludge will need to be removed.

Replacement Bag Filters
and Spin-on Filter Elements
for the MTC-X System

Primary Filter Bag Elements

Secondary & Tertiary Filter Elements

MTC-X Literature

MTC-X Diesel Fuel Tank Cleaning

MTC-X Tank Cleaning

Click on Graphic to Enlarge

MTC-X Mobile Tank Cleaning
Cart System Components

MTC-X Components

Click on Graphic to Enlarge

1. Primary Bag Filter Vessel (Clamp is Optional)

9. Secondary Fine Filter (Sold as void filter)

2. Isolation Ball Valve

10. Discharge Port (Cam and Groove)

3. Suction Port (Cam and Groove)

12. No-Spill Injection Switch

4. Pre-Filter Drain Port

13. Water Level Indicator

5. Fine Filter Differential Gauges

14. Pump Vacuum Gauge

6. Tertiary Fine Filter

15. Static Head Vaccuum Gauge

7. Pump/Motor


Mobil Tank Cleaning Series Functionality

AXI (formerly ALGAE-X®) Mobil Tank Cleaning Systems are designed to efficiently and safely clean and restore fuel to a pristine condition. Vital to the fuel polishing process, these systems incorporate a multi-stage filtration process that reconditions, stabilizes and decontaminates diesel fuel, bio-fuels, light oils, and hydraulic fluids. All MTC systems are specifically designed for tanks with contaminated fuel that require the removal of water, sediment, and sludge accumulation.

AXI’s Mobile Fuel Polishing Systems are built with industrial quality components, mounted on both a heavy duty aluminum cart (MTC Series) and/or carbon steel skid (MTC-HC Series) with capacities up to 150 GPM. All MTC and MTC HC systems feature multi-stage water removal, particulate filtration, fuel conditioning (with the optional Fuel Conditioner on the MTC-X), a compact industrial design locking cam and groove connections, built-in spill containment tray, and bypass loop capability. MTC HC systems also offer multiple sampling ports, large contamination holding capacity, robust compact industrial design, liquid-filled vacuum and pressure gauges, AXI Watect water sensor, and PLC filtration system controller.

The MTC-X is designed and engineered to be a highly efficient Tank Cleaning System. The MTC-X, when equipped with the optional Fuel Conditioner, polishes, conditions and stabilizes diesel and bio-fuels, eliminates microbial contamination, and ensures fuel remains clean and dry. These MTC systems are designed to offer the maximum in flexibility and mobility, and, as a critical part of a Fuel Management Program, will keep your tanks clean and your fuel in "Clear & Bright" pristine condition at all times providing maximum efficiency and minimal emissions. AXI’s LG-X Fuel Conditioner, included on every MTC System (optional on the MTC-X), reverses fuel deterioration and removes sedimentation to sub micron levels, preventing clogged filters, extending injection system service life, and reducing smoke, emissions and downtime.

All MTC Systems feature:

  • Multi-stage Water Removal and Particulate Filtration

  • Compact Industrial Design

  • Locking Cam and Groove Connections

  • Built In Spill Containment Tray

  • Primary and Secondary Filtration with By-pass Loop Capability

  • Self-Priming Rotary Vane Pumps with Integrated Adjustable Bypass Valve

An MTC Series Fuel Polishing System is the central component of a Fuel Management Plan that involves the maintenance of numerous fuel tank or providing fuel polishing services to your customers over a wide region. Establishing a fuel management and maintenance protocol should include removal of accumulated water, periodic fuel circulation for particulate filtration and polishing of the fuel, and treatment with a Diesel Fuel Catalyst made to work hand-in-glove with the Fuel Polishing System to clean the fuel tank without removing the fuel, assuring that the lights stay on when the power goes off.

The MTC-X Series Systems

The AXI MTC-X Mobil Tank Cleaning (MTC) System is a special purpose designed two-stage mobile tank cleaning system. It efficiently decontaminates Diesel Fuel, Bio-Diesel and light Hydraulic Fluid tanks. It efficiently removes sludge, water and sediments that naturally accumulate in tanks. The MTC-X system excels in low operating cost and compact design.

When the MTC-X Mobil Tank Cleaning System is equipped with the optional Fuel Conditioner, it conditions and restores fuels and oils to their "Clear & Bright" condition and eliminates fuel "algae" issues, clogged filters and tank sludge, providing Optimal Fuel Quality for Peak Engine Performance and Reliability.

All storage tanks naturally accumulate water, solids and sludge resulting from condensation and the degradation of fuel and oil. Many tanks have not been cleaned or maintained for many years. The MTC-X is specifically designed to focus on cleaning the worst of the worst contaminated tanks, efficiently removing sludge, debris, and water in the most cost effective means by utilizing as its Primary Filtration vessel a high capacity bag filter system. Other MTC Systems utilize a centrifuge as the primary filter. While very capable of sludge and water removal, the cleaning process of badly contaminated thanks will require shutting down the MTC System to empty the centrifuge system and extend operating time significantly.

Filter bags are inexpensive compared to regular fuel filters (see prices along the right side of this page), have greater capacity to accumulate sludge and contaminates before requiring operator attention, and are available from 800 microns down to one micron. When cleaning very contaminated tanks, it is possible that larger micron bags be emptied and reused several times until they become damaged or sufficiently clogged such that fuel will no long pass through them. This allows for extended use in contaminated tanks with extensive tank bottom contamination.

Generally a fuel preventative maintenance program will require the fuel conditioning and tank cleaning process to include circulating the contents of a fuel tank three times on some periodic basis depending on the quality of incoming fuel and regional climate conditions. The MTC-X is designed to run until a badly contaminated tank has reached an acceptable level of clean before moving on to the next tank.

When tanks are this dirty, fuel conditioning is an afterthought until the tank sludge and debris is removed. Companies with many tanks to clean initially use the MTC-X, and then switch over to another MTC cart mounted system for ongoing preventative maintenance. However, if more than one cart is not in the budget, the optional Fuel Conditioner is available for in-line installation to provide fuel conditioning on an ongoing basis.

The more fuel we put into and take out of a tank the more debris and water will accumulate in the bottom. AXI Fuel Conditioning and Tank Cleaning Systems eliminate the need for costly periodic tank cleaning, while stabilizing and extending the shelf life of fuel. This is extremely important for all applications of long-term fuel storage, especially emergency generators.


The AXI MTC-X Mobile Tank Cleaning System is specially designed for cleaning badly contaminated tanks for operations where there are many tanks requiring attention, possibly over a wide geographic region. Once tanks are cleaned to an acceptable level and attention is directed to preventative maintenance, the primary filtration bag vessel can be outfitted with a smaller micron rated bag to to further extend the life of the secondary spin on filters. The secondary and tertiary filters, being positioned in the fuel flow in a bypass loop, allow for fine filtration of particulates and emulsified water separately, providing more flexibility and opportunities for extending filter utility.

The MTC-X is ideal for industries such as remote oil/gas dilling operations and processing, cell tower backup power fuel tanks, heavy marine applications such as a tug boat fleet, mining operations, and similar industries. Also, remote resorts, such as island resorts or wilderness resorts where fuel comes in by barge and may be that which others have rejected, would benefit greatly by this equipment.

MTC-X Tank Cleaning System

Click on Graphic
to Enlarge

MTC Functionality

AXI MTC Systems are built with industrial quality components mounted on a heavy-duty aluminum frame and mounted on an aluminum two-wheel cart. The MTC-X features stainless steel plumbing and quick disconnect fittings. A clear suction hose show fuel flow and clarity. The large drip tray is designed to prevent spillage. Fuel can be circulated using on the bag filter by positioning the ball valve to bypass the spin on fuel filters. A differential pressure gauges are provided for both the secondary and tertiary spin-on filters to ensure optimal filter usage.

The MTC System processes fuel or oil by pumping it from the tank through the intake hose to the intake port, through the Primary Bag Filter Fuel-Water Separator to the optional AXI Magnetic Fuel Conditioner. Note that the optional Fuel Conditioner may be added to your order during the selection of other options (such as alternate power) in the order process.

After passing through the pump, the fuel flow enters a ball valve that will either direct the flow directly to the discharge hose, bypassing the spin-on filters, or through the Secondary and Tertiary spin-on filters before reaching the discharge hose and be directed back to the tank. Having this ball valve to direct the flow allows for reserving the Secondary and Tertiary Spin-On filters for use in the Second Phase of the tank cleaning process when the amount of solids, sludge and debris has been largely contained by the bag filter and water has been evacuated from the bottom of the bag filter vessel. The entire process of cleaning the fuel tank and conditioning the fuel is explained in more detail further below on this page at "General Tank Cleaning Procedures". Although other MTC and MTC-HC System may require relocating the discharge hose from port two to port three on those system, the MTC-X has the ball value to redirect flow.

AXI LG-X 3000 Fuel Conditioner

Click on Graphic
to Enlarge

The principal components of the MTC-X are a continuous-duty self priming rotary vane pump, a PF-30 HD Bag Filter Vessel, the optional AXI Fuel Conditioner, and a Secondary Spin-on Filter and Tertiary Spin-on Filter, both equipped with a Pressure Gauges for monitoring filter element changes, utilizing either various fine particulate removal or water block filter elements.

Optional AXI Fuel Conditioner

The fuel flows into the AXI Fuel Conditioner after exiting the Primary Filter. Operating on the principal of induction on the process of combining kinetic and magnetic energy to influence the behavior of electrons, the AXI Fuel Conditioner provides a powerful magnetic field and the flow of fuel provides the kinetic energy.

As fuel deteriorates, clusters of fuel components break down and residue begins to accumulate, resulting in dark, hazy fuel with poor combustibility. The increase in size and mass of the fuel breakdown products lead to clogged filters and the build up of tank sludge. The AXI Fuel Conditioner dissolves the clusters, stabilizes the fuel, and eliminates tank sludge. The results are Clear & Bright Fuel, improved filterability, optimal combustion and clean fuel systems. The process of how the AXI Fuel Conditioner makes clear, bright and more combustible fuel as well as restoring degraded fuel and eliminating the effects of microbial contamination is compelling. As the AXI Fuel Conditioner does not filter the fuel, but treats it as it passes through the unit, there is seldom any reason to suspect that a restriction is in the AXI Fuel Conditioner. But you can remove the face plate, remove the magnet and wipe it off with a shop rag and replace the filter and face plate. A spare parts kit for the AXI Fuel Conditioner includes a new face panel O-Ring and replacement screws to fasten the face plate.

PF-30 HD Bag Filters

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to Enlarge

Primary Filtration for the MTC-X Systems

The MTC-X Tank Cleaning System utilizes the PF-30 HD Bag Filter Vessel. The PF-30 HD Bag Filter Vessel uses felt or multi-filament mesh filter bags to remove heavy particulate and sludge from 800 micron down to 1 micron, and a perforated, stainless steel strainer is also included. The bags are inexpensive compared to spin-on filter elements and are, to a limited extent, re-usable, further reducing the expense of doing fuel maintenance by reducing the cost of disposable supplies.

A Water Sight gauge is installed on the front of the PF-30 HD Bag Filter Vessel to observe the level of water accumulation within the Bag Filter. Monitor the gauge and drain the water as often as needed using the drain valve on the bottom of the Bag Filter.

MTC-X Fine Filter Mode

Click on Graphic
to Enlarge

Two vacuum gauges are provided on the front of the Primary Filter Bag Vessel. The top gauge provides a reading on the suction line into the filter, and the lower gauge provides a reading on the inside of the bag, allowing you to use the differential gauge reading to determine when the bag requires operator attention.

An optional water sensor and alert module may be added to the FP Water Separator-Purifier that utilizes a 9 volt powered audible and visual alarm to advise when the FP Series unit requires draining.

Secondary and Tertiary Filtration for Mobile Tank Cleaning Systems

WBS-3 Water Block Filter Element

The Secondary and Tertiary Filters are spin-on filters for fine filtration down to 1 micron or for a Water Block coalescing filter down to 3 micron. See the graphic at the left. The filter that is supplied with the MTC-X System in the Secondary Filtration position is a spin-on filter housing without any element inside the metal container, known as a Void Canister. This allows use of a single filter in the Tertiary position.

MTC-X Fine Filter Mode

Click on Graphic
to Enlarge

Fine Filtration Mode can be engaged during operation by changing the position of the ball valve to position 2. This will divert the flow of fuel through the spin-on filtration plumbing. The fuel will enter filter #1 first (void filter if only using single filter) and then flow through filter #2. When the system is in Fine Filtration Mode utilizing two (2) filters, it is important to install the filters in the correct order. The higher micron rated filter should be installed as filter #1, and the lower micron rated filter should be installed as filter #2. This process removes larger particulate, then fine particulate (or water), as shown in Figures A, B & C.

MTC-X Fine Filter Mode MTC-X Fine Filter Mode MTC-X Fine Filter Mode

The filter housing includes two gauge that reads the differential pressure and, when the back pressure increases indicating that the flow of fuel is being restricted by the accumulation of particulates or other debris on the filter element inside the spin-on filter, it is time to change the filter. This assures that you are not leaving a filter on too long, compromising the filtration process, or changing the filter too soon and not receiving all the value for the filter and increasing your operating costs.

In addition, the MTC-X has a vacuum line to remove fuel from the filters when they need to be changed. With the MTC-X running, redirect the fuel flow using the ball valve to bypass the spin-on Secondary and Tertiary filters. A valve will open a vacuum line from the Primary Bag Filter connecting to the Secondary and Tertiary filter lines to pull fuel from the Spin-on Filters so that the fuel in the filters will drain down, reducing the amount of fuel in the filters allowing for little or no fuel to be spilled into the spill tray during the process of changing the filters.

For most applications where fuel is stored for future use, a circulation system that consistently maintains water-free fuel storage and fuel filtered to a particulate level of 10 microns is acceptable. AXI offers seven different filters for the MTC Systems. The fine filter spin-on filter elements are rated at 1, 3, 10, 25 and a 3 micron filter that is an X-Glass element. Also offered are 3 and 10 micron Water Block Filter elements. (see pricing at the links in the table to the left under "Replacement Filter Elements for the MTC Systems".

The 3 micron Water Block filter is usually the preferred filter for ongoing preventative maintenance. The WB3 filter element will remove free water and emulsified water from the fuel stream along with the removal of particulates. Most engine manufacturers want the fuel entering their engine to be filtered at 4 microns, removing particulates and organic debris from the fuel preventing these contaminants from causing problems with the tolerances of fuel injector systems. Although modern engines have a factory-provided filter, usually in the 4 micron range, supplying fuel to the filter that already meets these requirements will extend the life of the factory filter and also assure the fuel is in optimal condition for use in these highly developed injector systems. It is better to have the engine manufacturer’s filter be the last line of defense against contamination in stead of it being the only defense.

Sample the Tank Bottom

If a tank has a straight-line access to the bottom of the fuel tank from the fuel fill hole or through another inspection port, a length of PVC or similar material pipe, 1/2 inch in diameter, can be used like a soda straw to sample what is in the bottom of a tank. Cut the pipe to length to allow insertion of the pipe to the bottom of the tank while allowing your thumb to cover the exposed end of the pipe. With your thumb over the end, insert the pipe to the bottom of the tank, remove your thumb so what is at the very bottom will rush into the tube to the level of fuel in the tank. Again place your thumb over the end of the pipe and extract the pipe, maintaining the liquid and other materials inside the tube. Place an empty clear plastic 2 liter soft drink bottle upright in the bottom of a empty 5-gallon bucket. Direct the end of the tube into the drink bottle (any spilled liquid will be caught inside the five gallon bucket). Perform this action several times. Allow the contents of the bottle to settle (ideally overnight) and inspect the materials in the bottom of the drink bottle. Any debris or water should be apparent.

If your tank is larger and using a tube to recover fuel, water or other debris from the bottom of the tank is not possible, you can use a Tank Sample (TS) Fluid Sampler. You can take 4 oz., 8 oz, or 16 oz. samples using the AXI Tank Sampler or you can use a hand-held Sample Pump (at bottom of the AXI Tank Sampler page) to remove a sample, as described on the Tank Sampler page.

General Tank Cleaning Procedures

The MTC has two different operating modes (Bypass Mode and Fine Filtration Mode), providing the operator flexibility and time efficiency.

In Bypass Mode, bulk water and sludge are removed from the tank into a separate container for disposal. The fuel bypasses the fine filters, removing free water, sludge, and particulate, as small as 1 micron, from the tank. During this step, the system is not in a re-circulating mode. The fuel enters through the Inlet Port and exits through Discharge Port 1 into a separate waste container. Water and sludge are directly removed from the tank and collected in an appropriate container for disposal. Next step, while still in bypass mode, put the hose that was in a separate container back into the main ank to create a kidney loop. This process will further save and extend the life of the spin-on filters, and remove the worst of contaminants, before polishing with fine filters to meet the required cleanliness.

In Fine Filtration Mode, the MTC system is continuously restoring, reconditioning, and returning the fuel back to the tank. Fine Filtration mode will continuously remove free water and particles as small as 1 micron, utilizing high efficiency spin-on filters.

We always recommend keeping a “before” and “after” bottom tank sample for "show & tell" purposes to demonstrate the improvement of fuel color, clarity, and opacity.

System Operation

Operating Procedure

Hoses: The intake/suction hose is a clear, see-through reinforced vacuum hose. The return hose is black or blue/black, non-marking, high quality, discharge fuel hose. Both hoses are equipped with quick disconnects or Cam & Groove couplings.

  1. Attach quick disconnect end of clear suction hose to the quick disconnect Inlet Port of the MTC.
  2. We highly recommend attaching a straight wand or pipe (cut at an angle at the end that goes into the tank and is at minimum the same inner diameter as the suction hose) to the suction hose to reach the lowest part of the tank bottom.
  3. Attach quick disconnect end of blue/black discharge hose to quick disconnect Discharge Port 1 of MTC.
  4. Place the end of the discharge hose in an appropriate-size container (Phase One only). Try to not agitate the fuel in the tank and stir up and disperse water and sediment throughout the fuel –- this will make it more difficult to remove later on.
  5. For Phases Two and Three, place the end of the discharge hose back in the tank as far away as possible from the suction hose. Ensure that the hose is secured and will not vibrate out of the container when the system is operating.
  6. Verify that both drain valves are closed and the system is set up in a stable and safe position.

Note: Never restrict the flow on the suction side of an MTC; e.g. by using a smaller ID hose or pipe or attaching the suction hose to a fitting on the tank that has a smaller ID than the hose. This will lead to excessive pump load, noise and ultimately damage the pump.

Phase 1:

AXI recommends 3 phases to successfully polish a fuel tank. This will ensure all water is removed from the fuel, particulate is removed, and the fuel is in an optimal condition. The goal of Phase One is to remove any free water and sludge on the bottom of the tank without mixing the water into an emulsified state within the fuel.Start the pump motor and be ready to immediately stop it. The vane pump will start pumping as long as the system is primed and the suction lift is not excessive. The flow of fuel can be observed in the see-through suction hose. Watch for a steady flow of fuel into the container.

  1. Once the fluid begins to fill the discharge container, immediately switch off the motor and inspect the discharged fluid. Resume pumping and continue the above procedure until water and sludge have been removed from tank bottom and primarily fuel is discharged from the return hose.
  2. To remove as much of the free water and sludge as possible, the suction hose with a straight wand or pipe attached should be placed at the deepest part of the tank. If possible, move the suction hose/pipe to different areas of the tank to more efficiently vacuum the sludge off the bottom. After removing the bulk water and sludge from the tank, switch off the pump. Then, drain all water and debris from the hose and the water separator into an appropriate bucket placed under the drain valve.

Phase 2:

After removing the bulk of the sludge and water from the tank into a separate container for disposal and draining the separator, the return hose is now inserted into the tank. The goal of Phase Two is to remove any additional free water within the tank and also remove any large contaminants and sludge. This phase will clean the fuel and should be a precursor to using the more expensive spin-on filters. It should be noted that meeting required cleanliness codes is typically not possible with pre-filtering alone. Phase Two is used to extend the life of the spin-on filters, and remove the worst of the contaminants, before polishing with fine filters to meet the required cleanliness.

  1. Insert blue/black discharge hose into tank as far away from the suction hose as possible. In some cases, it is recommended to remove the sending unit cover to gain sufficient access to the tank. In many cases, both hoses will have to be inserted through the same tank fill opening.
  2. After verifying that both hoses are properly placed in the fuel tank and that the valves on the MTC system are in the correct position, switch on the pump and watch the clear suction hose for fuel flow.

Depending on the amount of contaminant in the tank, we recommend you stop the pump shortly after priming and check for free water and sludge by draining the water separator. It may be necessary to depress the air purge valve on top of the separator after opening the drain valve.

Repeating this process and observing the fuel flow will indicate how long the pump should run before it is necessary to drain the separator.

  1. The MTC should be kept running in the Phase Two recirculating mode until clean fuel samples can be drained from the separator. Then, switch off the pump for final polishing.
  2. Now is the time to add AXI International AFC-705 Fuel Catalyst in a dose of 1 : 2500 or 1 gal of AFC-7010 for 2500 gallons of fuel. Higher doses of AFC-705 may be necessary depending on condition of fuel.

Phase 3:

Phase Three is the most important phase in meeting specific cleanliness codes. Unlike the pre-filter, the spin-on filters typically use absolute rated media. Absolute filters have a very high efficiency and will ensure that fuel leaving the system is clean to specification and has a low water content. Like previously mentioned, pre-filtering should be performed to remove any large particulate, water, and sludge. Pre-filtering will extend the life of the spin-on filters.

  1. Connect the return hose to Discharge Port 2.
  2. Start the pump and the system will run in the re-circulating mode restoring the fuel to its optimal pristine and sparkling condition.
  3. Monitor the pressure gauge on the filter head. When the pressure reaches 20 - 25 PSI, or reaches the red area it is time to change the filter.

Recommended Tank Cleaning & Fuel Treatments

AFC-705 Diesel Fuel Additive

It is recommended that diesel fuel be treated with the AXI Fuel Catalyst AFC-705 (for pre-2007 engines) or AFC-710 (Tier 4 compliant) Diesel Fuel Catalyst prior to the initial tank cleaning and at least every six months thereafter to assure the fuel tank remains clean and the fuel is stabilized. This will enhance and accelerate the tank cleaning process by breaking down and dissolving existing tank sludge. Always check the fuel tank for an accumulation of water in the bottom of the tank. Using a rod, sometimes used to measure fuel in a storage tank, or a length of PVC pipe, spread a line of Kolor Kut Water Finding Paste on the side of the rod or pipe and insert to the bottom of the tank. If the paste touches water, it will change colors, showing how much water is in the tank requiring removal.

AFC-710 Diesel Fuel Additive

Pump accumulated water out of the tank for proper disposal. It is often the case that all of the water is impossible to remove. AFC-705 contains a surfactant that will emulsify the residual water up into the fuel for removal by a Water Block Filter on the AXI Fuel Polishing System AFC-710 does not include this surfactant component). Depending on the condition of the fuel and the amount of sludge build-up, it is recommended to initially use a double dose of one to twenty-five hundred (1:2500 - one oz. to 20 gallons of fuel) and circulate the capacity of the tank five times. Always treat the tank when the tank is full of fuel. If you perform a treatment with a half tank of fuel, you will only be cleaning the bottom half of the tank. The use of AXI Fuel Catalyst has proven to be essential in accelerating the tank cleaning process. AFC-705 and 710 contains detergent, dispersant, corrosion inhibitor, lubricity enhancer and combustion catalyst. AXI Additives do not contain biocides.

AFC-710 Powder Diesel Fuel Additive

For engines manufactured in 2007 and later, use AFC-710, available in both liquid and powdered form. AFC-710 does not contain the surfactant (used to emulsify residual water into the fuel for removal in the circulation process as does AFC-705), a component that does not allow for qualification as a Tier 4 product. AFC-705 and AFC-710 should always be used periodically in particular to stabilize fuel that is stored for longer periods of time.

After the initial cleaning, the AFC-705 or AFC-710 in the fuel will continue to stabilize the fuel for six months or more. Every six months, or more often if the region in which you reside is a humid climate, treat the fuel again and circulate the capacity of the tank three times. In applications where fuel from a treated tank is distributed to other equipment, the additive will also clean the downstream tanks and continue to stabilize the fuel.

AFC-710 Powder

Tank Cleaning & Fuel Treatment for Cold Weather Use

For cold weather operations, AXI Fuel Catalyst AFC-805 is a unique and powerful anti-gelling broad-spectrum fuel additive specifically formulated for use in Diesel, Bio-fuels, Gasoline, Kerosene, and HFO. AFC-805 should be used as part of any preventative fuel maintenance program, and is ideal for use in bulk storage fuel tanks in cold weather environments. AFC-805 enhances the breakdown and removal of sludge, slime, and bio-fouling from tank walls and baffles that are difficult to access.

AFC-805 effectively decontaminates and cleans an engine’s entire fuel and injection system. It continues to work in storage tanks cleaning and stabilizing fuel for up to 12 months with a single dose. AFC-805 is ideally used for cold weather applications where there is long term fuel storage, such as bulk fuel farms, winterized recreational and work boats, and also smaller engines. AFC-805 is recommended at a ratio of 1:5000 (one oz of AFC-805 to 40 gallons of fuel)

The Following Guides
Tell the Story

Fuel Management System Operation

The fuel you depend on should always be in optimal condition. Periodic circulation of fuel assures optimal combustibility and fuel cleanliness. All major diesel engine manufacturers have set minimum fuel standards for the diesel fuel to be used in their engines, and failing to maintain fuel that meets those standards could lead to engine component failures and denied warranty claims. As an example, Caterpillar has published "Cat Commercial Diesel Engine Fluids Recommendations" (SEBU6251-17 September 2014 [a more recent version may be available]) that states "In order to meet expected fuel system component life, 4 micron(c) absolute or less secondary fuel filtration is required for all Cat diesel engines that are equipped with common-rail fuel systems." (Page 34) You should not assume that fuel being delivered to you meets the engine manufacturer’s requirements, and certainly fuel that has been in your storage tank for an extended period of time is unlikely to meet requirements of diesel engine manufacturers without a Fuel Management Program.

Cleanliness standards for diesel fuel, established in the late 1990’s by the International Organization for Standardization (ISO), apply to diesel fuel. Caterpillar recommends that the fuel dispensed into the machine tank meets "ISO 18/16/13" cleanliness level." (Page 49) For more information on fuel cleanliness specifications and what those requirements mean to you, review the "Diesel Fuel & Injector Failure" web page on this site.

Continued vigilance to assure that your fuel is in the best condition possible and always meets the requirements to maintain engine manufacturer's warranty requirements is a major challenge without the use of an AXI Fuel Conditioning & Tank Cleaning System to address the need for periodic Fuel Polishing.

Fuel Maintenance Plans

Clogged Fuel Filter

A Fuel Maintenance Plan should be a part of every periodic engine Preventative Maintenance Program. Preventative Maintenance Programs are common in all major industries today, but monitoring the fuel condition is often taken for granted and not included in the Preventative Maintenance Program. Many of today's maintenance personnel have many years of experience, but until changes in sulfur content in diesel fuel were regulated within the past decade, and with the government’s push for blending some amount of bio-diesel into regular diesel fuel, maintenance professionals were never presented with the problems that we are experiencing today. With today’s advances in design and engineering of diesel engines, especially the new fuel injection systems, and with more emphasis being placed on critical requirements that equipment have longer life cycles and near 100% uptime, fuel management can no longer be ignored. It is now just as important as changing the oil, ensuring the batteries are charged, and the air filter is clean.

Service Agreements with an outside contract company to perform Preventative Maintenance typically do not cover fuel-related management and monitoring unless specified. In-house maintenance personnel are usually pressed for time, and fuel management can be easily glossed over. Fuel has a limited shelf-life and even "fresh fuel" could contain water, sediment, microbes, asphaltene agglomeration, or other contaminate components upon delivery and cause immediate engine performance issues.

Emergency power installations are especially susceptible to unexpected interruptions due to fuel related issues. Periodic generator tests-runs are too short to determine if fuel quality is adequate for the demands of continuous, full-load operation. In fact, generator test runs have been found to significantly accelerate the fuel polymerization and degradation process, resulting in the accumulation of gums and resins in the fuel system, by returning fuel that has been compromised by heat and pressure back to the tank. Thirty minute tests, often performed every month, create the environment in the tank for problems to grow. After extended periods of testing, sometimes years, without having been subjected to an extended full load, operation is interrupted by clogged filters when the lights go out.

Now that you have decided to institute a Fuel Management Plan for your operations, there is work to do. Consider the following as the basis for your Fuel Management Program to further assure that your equipment will run when it is needed most at it’s peak level of performance and repair costs will remain under control:

  • Place in service an AXI Fuel Treatment & Tank Cleaning System appropriate to your operations that are capable of performing a complete tank cleaning and fuel conditioning on each fuel tank in service at least once per year (more often in regions of high humidity). Evaluate what other aspects of fuel monitoring and testing is needed to assure that critical equipment needs, including down-stream equipment, may need to be included in your Fuel Management Plan.

  • Use AXI Broad Spectrum Fuel Catalyst Ultra Concentrate AFC-705 or AFC-710 every six months to enhance the breakdown and removal of sludge, slime, gums, resin, and bio-film from tank walls and baffles that are difficult to access and normal fluid flow does not break loose. Having this unique fuel additive present when fueling downstream equipment also assures that these downstream tanks are being cleaned in the normal course of operations (although separate water removal will be necessary).

  • Periodically (every 30 to 60 days, depending on your climate) use a Fluid Sampler or a hand Fuel Sample Pump to take samples of your fuel from each storage tank and critical equipment fuel tanks for in-house testing for acidity (pH) and use Liqui-Cult Fuel Test Kits to perform testing for microbial contamination. If initial tests indicate fuel problems, utilize laboratory analysis to evaluate the condition of your fuel to assure your fuel supplier is providing fuel that meets the specification of the engine manufacturer you depend on to keep your equipment running.

  • If the quality of your fuel is suspect, consider establishing a quarantine tank to accept new shipments (do not add new shipments of fuel to your stored fuel that has been de-watered and to which you have performed fuel polishing, and is known to meet your Fuel Management protocols).

  • Use Kolor Kut Water Finding Paste at least every 30 to 60-days to monitor the accumulation of water in your storage and equipment fuel tanks due to condensation or from fuel fills. If any amount of water is detected, take steps to remove it.

  • Install Desiccant Breathers on all your fuel storage tanks to help prevent moisture from entering your tanks through the vent as fuel is consumed.

  • Use Water Eliminators in each storage and equipment fuel tank to capture water and remove it before it can cause problems with engine operations or seasonally prevent water from freezing in fuel lines?

With only moderate effort, you can be assured that your diesel fuel will provide optimal performance and enjoy the expected life of your engine’s fuel filters, fuel system components, and your substantial investment in the diesel engine.