Frequently Asked Questions

You’ve Got Questions? We’ve Got Answers!

What are your tanks made from?
Transfer Flow tank systems are crafted with 12- and 14-gauge high-yield U.S. aluminized steel that is powder coated for a longer-lasting, durable finish. Aluminized steel is steel that has been electroplated with aluminum at the steel manufacturers. By electroplating the steel with aluminum, it acts as a corrosion resistant material. It’s the same material we have used for 40 years for our aftermarket and OEM fuel tanks!

Where are your tanks manufactured?
Transfer Flow fuel tank systems and accessories are engineered and manufactured in the USA at our 72,000 sq. ft. facility in Chico, California, and our 35,000 sq. ft facility in Algood, Tennessee.

Why are Transfer Flow fuel tanks expensive?
Our mission is to support our customers, community, and country by engineering and manufacturing premier quality “Made in the USA” fuel systems and vehicle accessories. Transfer Flow fuel tanks are made in America, by hard-working Americans, using only the finest U.S. materials and production equipment. Keeping our products premier and American-made is costly, but we firmly believe in the value and integrity of American craftsmanship. 

Do Transfer Flow tanks come with a warranty?
Transfer Flow fuel systems are covered by a six-year, unlimited mile warranty* against defects in material and workmanship throughout the U.S. and Canada from the unit purchase date by the original purchaser for the original vehicle the unit was installed in. For specific information regarding part exceptions, exclusions and limitations, warranty claim procedures, and federal regulatory provisions, please see our full warranty details on our website at

* Part numbers 070-TK-34310 and 070-TK-34311 come with a one-year, unlimited-mile warranty

Download Warranty PDF

Will I void my vehicle’s warranty by installing a Transfer Flow tank?
Transfer Flow fuel tanks will NOT void the vehicle’s warranty. The Magnuson-Moss Warranty – Federal Trade Commission Improvement Act of 1975 protects consumers from such fraudulent activity by new car dealers. Under this Act, aftermarket equipment that improves performance does not void a vehicle manufacturer’s original warranty, unless the warranty clearly states the addition of aftermarket equipment automatically voids your vehicle’s warranty or if it can be proven that the aftermarket device is the direct cause of the failure. The easiest way to check this is to look in your owner’s manual under, “what is not covered”. Under Magnusson-Moss Act a dealer must prove, not just vocalize, that aftermarket equipment caused the need for repairs before they can deny warranty coverage. If they cannot prove such a claim or offer an explanation, it is your legal right to demand compliance with the warranty. The Federal Trade Commission administers the Magnusson-Moss Act and monitors compliance with warranty law.

Will a Transfer Flow tank affect SMOG results?
No, Transfer Flow tanks do not affect SMOG results.

Can I use a Transfer Flow tank in conjunction with another aftermarket fuel tank?
No, Transfer Flow fuel tanks are never to be used in conjunction with fuel tanks made by other aftermarket fuel tank manufacturers.

Does Transfer Flow sell gravity feed systems?
No, Transfer Flow rejects unsafe, unlawful, and inferior gravity-fed systems, and so should you! Due to safety, environmental, and legal concerns, Transfer Flow will not endorse, design, install, or sell gravity-fed fuel systems because of their inherent risks. With gravity-fed systems, if the valve, connectors, or fuel line malfunction (or you simply forget to close the valve), there’s nothing to prevent over-filling and a dangerous fuel spill. By installing a gravity-fed system, you disable the safety features of your vehicle’s fuel system. Our fuel tanks are never to be used in conjunction with gravity-fed fuel systems. 

Are Transfer Flow refueling tanks DOT-approved?
Yes, Transfer Flow refueling tank systems have received a special permit from the Department of Transportation to carry and transfer gasoline, diesel, ethanol, methanol, kerosene, and aviation fuel. See accompanying tank materials for DOT stipulations and decals.

Download DOT Special Permit

Does Transfer Flow sell fuel tank systems for gasoline vehicles?
Transfer Flow manufactures and sells DOT-legal refueling tanks that are approved to carry and transfer gasoline, as well as diesel, ethanol, methanol, and kerosene. We also offer some replacement fuel tank systems for gasoline vehicles as well.

Will a high-capacity replacement tank affect my truck’s stock fuel gauge and trip computer?
Your stock fuel gauge will read accurately when our high-capacity replacement tank is installed on your vehicle. When your gauge reads half full, you have approximately half a tank of fuel. Most functions on your truck’s trip computer should work properly, except for the miles-to-empty feature. This feature will continue to read fuel levels as though you still have the stock tank installed. 

Will I need to purchase additional parts to install a Transfer Flow tank system?
When you order a Transfer Flow fuel tank system, you can rest easy knowing that you will receive a complete system with comprehensive step-by-step instructions and every part required for installation, down to the last zip tie! All high-capacity replacement tanks include mounting straps for secure underbody installation.

Can I purchase replacement parts for a non-Transfer Flow tank?
No, we do not sell parts for tanks made by other tank manufacturers because we cannot confirm the legality or safety of other tank manufacturers.

Can I install a Transfer Flow tank myself?
Yes, you sure can! We include comprehensive step-by-step installation instructions with all Transfer Flow fuel tank systems. We also have installation videos on our YouTube channel for visual reference. 

Want your tank installed by someone else?
Call us to schedule an installation appointment at our facility in Chico, California. If that’s too far of a drive for you, we have 200 authorized installers across the U.S. and Canada who can install your Transfer Flow tank and get you ready for adventure! To find an installer near you, click here.

TRAX 4 Frequently Asked Questions:

My TRAX 4 pump button light is blinking. What does this mean?
This could mean you have not set up your TRAX 4 system yet or TRAX 4 has detected an error condition. Please see your TRAX 4 User's Guide for more details.

Why doesn’t my TRAX 4 display work when I start my vehicle?
Depending on your version of TRAX 4, the vehicle needs to be moving before the display will power on.

Why doesn’t my TRAX 4 pump work when I start my vehicle?
Depending on your version of TRAX 4, the vehicle needs to be moving before the pump will begin its transfer logic.

Why isn’t the auxiliary fuel level showing on the app?
When initially installed or when the auxiliary fuel tank is run empty, the tank must be filled to at least 25% for TRAX 4 to register fuel level again.

What is my Bluetooth Pairing request code for the TRAX 4 mobile app?
The Bluetooth pairing code is 123456.

What is the difference between Transfer Flow TRAX operating system versions?

TRAX 4 (2020—current)
TRAX 4 is our app-based computer-controlled fuel management system that transfers fuel from a Transfer Flow auxiliary fuel tank to your pickup’s main fuel tank. Want to know the status of your onboard fuel systems? Download the TRAX 4 mobile app to your smartphone and enter your vehicle and fuel system information. You’ll be able to monitor your pickup’s fuel capacity in no time!

Download TRAX 4 User's Guide

TRAX 3 (2013–2020)
The TRAX 3 system was the third patented computer-controlled system for auxiliary tanks. TRAX-3 included easier-to-read LCD graphics. This system included an auxiliary fuel tank, auxiliary fuel pump, all mounting hardware, fuel lines, and the computer module with LCD.

Download TRAX 3 User's Guide

MAXFLO-TFI (2013–2015)
The MaxFlo-TFI module allowed for automatic fuel transfers from the auxiliary tank to the main tank. This version of the computer-controlled system did not come with a dash-mounted display or switch. The system did have an optional upgrade to include a small dash-mounted digital lightbar that displayed the fuel level in the auxiliary tank only.

Download MAXFLOW-TFI User's Guide

TRAX-II (2004–2013)
The TRAX-II system was the second patented computer-controlled system for auxiliary tanks. TRAX-II incorporated the computer module into the dash-mounted display and improved the transferring process from TRAX-UFS. This system included an auxiliary fuel tank, auxiliary fuel pump, all mounting hardware, fuel lines, and the computer module with LCD.

Download TRAX-II User's Guide

EXPRESS-UFS (2005–2011)
The EXPRESS-UFS auxiliary system came pre-assembled with the 70-gallon in-bed auxiliary fuel tank. This system included an auxiliary fuel tank, an auxiliary fuel pump, all mounting hardware, a wire harness, fuel lines, and a computer module. The computer module for this system was located with the tank unit and did not come with a dash-mounted display. In 2009, Transfer Flow redesigned all auxiliary tanks to use the EXPRESS-UFS system.

Download Express-UFS User's Guide

TRAX-UFS (1998–2004)
Trax-UFS was Transfer Flow’s first patented computer-controlled system for auxiliary tanks. This system came with an auxiliary fuel tank, in-line pump, auxiliary sending unit, wire harness, computer module, installation kit, and dash-mounted LCD. It removed the need to manually toggle between main and auxiliary fuel tanks and automatically transferred fuel into the main fuel tank.

Download TRAX-UFS User's Guide