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Phoenix, Arizona

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Tucson, Arizona


Auxiliary Fuel Tanks

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Tranfer Flow In-Bed Auxiliary Tanks

Auxiliary Fuel Tanks
Increase your Ford, GM or Dodge Ram diesel pickup’s fuel capacity and driving range with an in-bed auxiliary fuel tank systems from Transfer Flow! Transfer Flow in-bed auxiliary tanks are available in 37, 50, 75, 98 and 100 gallons, and are available in sturdy aluminized steel and bright diamond plate. Transfer Flow fuel tanks are fully baffled to minimize fuel sloshing and come complete with all necessary installation components and detailed instructions (some pickups require a fillneck kit or tee). Using the patented technology of our TRAX 3™ operating system, the transfer process is entirely automatic and 100% worry free! Exclusive design features allow some tanks to be used in conjunction with other popular cargo accessories such as retractable truck bed covers and tonneau covers. Let us "fuel your adventures" with a safe, legal and durable in-bed auxiliary fuel tank system from Transfer Flow!
  • Operates with Transfer Flow's patented TRAX 3™ operating system
  • Fuel transfers automatically from in-bed fuel tank to stock fuel tank
  • Available in 37, 40, 75 and 100 gallons
  • Manufactured from aluminized steel or aluminum diamond plate
  • Baffled to reduce fuel sloshing
  • Won't interfere with standard fifth wheel hitch
  • Optional Spray-on coating available
  • Proudly made in the USA!


TRAX3 Monitoring System Included

Transfer Flow #16180 37 Gallon Auxiliary Tank
37 Gallon Auxiliary Fuel Tank - #16180
Ideal to work under roll-top and folding tonneau covers

Price: $1,915.95


Our 37 gallon in-bed fuel tank fits short and long bed pickups. It's designed to fit under Pace-Edwards and Truck Covers USA retractable bed covers. The tank is available in 14 gauge aluminized steel with black powder coat finish.
  • Ideal for pickups with roll-top or folding tonneau covers installed
  • Trax 3 Monitoring System Included
  • Dimensions: H: 18 1/2" x W: 19 1/2" x L: 50"
  • Add 3 inches to the length & width for munting brackets
  • 37 Gallon Fuel Capacity


Transfer Flow #16637 - 40 Gallon Auxiliary Tank
40 Gallon Auxiliary Fuel Tank - #16637
Fits Most Trucks Including 1/2 Ton Trucks

Price: $1,854.95


Finally, an almost universal auxiliary fuel tank. Our 40-gallon in-bed auxiliary fuel tank system 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. You'll be pleased that its low height means it can fit under most standard tonneau bed covers.
  • Fits most trucks including 1/2 ton trucks
  • Trax 3 Monitoring System Included
  • Dimensions: H: 19 3/8" x W: 19" x L: 48"
  • Add 3 inches to the height for fillneck and/or sending unit cover box
  • 40 Gallon Fuel Capacity - Diesel


Transfer Flow #16755 75 Gallon Auxiliary Tank
75 Gallon Auxiliary Fuel Tank - #16755
Surprisingly Space Saving

Price: $1,915.95


Our 75 gallon in-bed fuel tank is just 18" deep and delivers a significant increase in fuel capacity while maintaining maximum cargo space. The tank fits short and long bed pickups. It is available in 14 gauge aluminized steel with black powder coat finish (tanks shown in photo has our optional spray-on coating).
  • Trax 3 Monitoring System Included
  • Dimensions: H: 19" x W: 18" x L: 59 1/2"
  • Add 3 inches to the width for munting brackets
  • Add 3 inches to the height for fillneck and/or sending unit cover box
  • 75 Gallon Fuel Capacity


Transfer Flow 100 Gallon In-Bed Auxiliary Fuel Tank, #16758
100 Gallon Auxiliary Fuel Tank - #16758
High Capacity Fuel Storage

Price: $2,247.95


Miami to Chicago without stopping for fuel? That's no big deal for you when you install the impressive 100-gallon auxiliary. This tank is our biggest in-bed auxiliary fuel tank, holding up to 100 gallons of additional fuel to go the distance without needing to stop for fuel. The auxiliary system is computer-controlled by our patented TRAX 3™ operating system with patented AutoTrans® technology, and is equipped with a NAPA-3270 (WIX 33270) fuel filter. Transfer Flow fuel tanks are built from ReliaSteel®, high-yield U.S. aluminized steel; and powder coated black for superior corrosion resistance and strength.
  • Ideal for long trips without frequent fuel stops
  • Trax 3 Monitoring System Included
  • Dimensions: H: 22 3/4" x W: 26 3/4" x L: 67 3/4"
  • Add 3 inches to the height for fillneck and/or sending unit cover box
  • 100 Gallon Fuel Capacity - Diesel
  • Aluminuminuzed steel with black powder coat finish