Transfer Flow Auxiliary Tank

The Transfer Flow steel auxiliary fuel tank is designed for short bed and long bed diesel trucks. 

Choose from the following options:

• 37 Gallon Under Canister Tonneau: designed to fit underneath tonneau bed covers with a canister (retrax covers).  The canister style cover dips below the bed rails at the very front of the cab and requires a lower height design to fit.
• 40 & 50 Gallon Under Tonneau: designed to fit under standard tonneau covers that stay flat above the bed rails.
• 40 Gallon Under Toolbox: designed to fit under a bed rail toolbox.
• 75 & 100 Gallon Sizes: designed for long bed trucks.

The Transfer Flow In-Bed auxiliary fuel tank is designed to be compatible with almost any diesel truck, including half-ton pickups, trucks with utility beds, RamBox equipped trucks, or those with a factory installed 5th wheel prep package or other 5th wheel hitch. 

The patented fuel tank design has a recessed cover box where the sending unit, rollover valve, and fuel filter come preassembled. 

This auxiliary system is computer-controlled by the patented TRAX 4™ operating system with exclusive AutoTrans® technology. 

Want to know the status of your on-board fuel systems? Simply download the TRAX 4™ app to your smart phone and enter your vehicle and fuel system information.

During fuel transfer, the message “PUMP ON” will be displayed. You also have the option of displaying either the gallons or the percentage of fuel in each tank.

If you prefer not to use the TRAX 4™ app with your auxiliary tank but still want to know how much fuel you have, Transfer Flow offers an in-cab fuel level monitor LCD.

The LCD shows the fuel level of the auxiliary tank with an easy-to-read bar graph that decreases when fuel is transferred to the pickup’s main fuel tank. This item is sold separately.

The Transfer Flow steel auxiliary tanks are powder coated black and made with US aluminized steel for superior corrosion resistance and strength.

Tonneau Cover Recommendations:

• 37 Gallon - Designed for retractable & canister style tonneau covers with a hump that drops below the bed rail at the front of the cab (requires a reverse L shape to fit under the hump at the front of the cab).
• 40 & 50 Gallon - Designed for standard tonneau covers that remain flat across the bed rails.

Sizes:

• 37 Gallon Under Canister Tonneau - 53"L x 23"W x 18"H.
• 40 Gallon Under Tonneau - 48"L x 19"W x 19"H.
• 40 Gallon Under Toolbox - 49"L x 27"W x 12"H.
• 50 Gallon Under Tonneau - 61"L x 18.5"W x 18"H.
• 75 Gallon - 61"L x 20.5"W x 23"H.
• 100 Gallon - 61"L x 27"W x 23"H.

Notes:

• The 75 gallon and 100 gallon sizes include a fill neck located at the top of the tank. The height of the fill neck is included in the 22.75 inch height of the tank.
• The 40 gallon size fits the Chevy Colorado & GMC Canyon diesel trucks.

Fits:

• 37 Gallon Under Canister - 2008-24 Ford, 2011-24 GM, 2010-24 Dodge/Ram
• 40 Gallon Under Tonneau -2008-24 Ford, 2011-24 GM, 2010-24 Dodge/Ram
• 40 Gallon Under Toolbox -2008-24 Ford, 2011-24 GM, 2010-24 Dodge/Ram
• 50 Gallon Under Tonneau -2008-24 Ford, 2011-24 GM, 2010-24 Dodge/Ram
• 75 Gallon - 2008-22 Ford, 2010-22 GM, 2020-22 Dodge/Ram
• 100 Gallon - 2008-22 Ford, 2010-22 GM, 2010-22 Dodge/Ram

Restrictions:

• 37 & 50 Gallon sizes: Does not fit on 2013-24 Ram short bed with 5th wheel prep package.
• 40 Gallon size: 2013-24 Ram Mega Cab & Crew Cab short beds require a mounting bracket kit
• 37, 40, 50 Gallon sizes: 2010-12 Ram Mega Cab & crew cab short bed pickup with single rear wheels require a filler neck part.

37 Gallon Aux Tank (for retractable & canister covers)

FEATURES

• Recommended for drivers who require additional fuel capacity but require a small footprint to maximize available bed space for 5th wheel hitches, Rambox beds, and cargo.
• Won't interfere with standard 5th wheel hitch.
• Robot-welded seams provide extraordinary strength, unlike rotationally molded plastic tanks or cheaper steel brands.
• Fuel tank systems include all components needed for installation.
• TRAX 4™ computer-controlled automatic fuel transfers for worry-free operation with exclusive AutoTrans® technology.
• Built from ReliaSteel®, high-yield U.S. aluminized steel powder coated black for superior durability and strength.
• Baffled to prevent fuel sloshing.
• 6 year, unlimited mile warranty.
• Made in the USA.

Other Auxiliary Tank Options:

• Transfer Flow Auxiliary Fuel Tank
• All Auxiliary Tank options