Transfer Flow 50 Gallon In-Bed Auxiliary Diesel Fuel Tank System - TRAX 4 (0800116625)

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Transfer Flow 50 Gallon Auxiliary Diesel Fuel Tank: Extend Your Journey

The Transfer Flow 50 Gallon Auxiliary Diesel Fuel Tank is designed to more than double your driving distance, making it an essential addition for long-haul drivers and off-road enthusiasts. This tank is designed with a low profile and small footprint to fit under most tonneau covers, leaving you plenty of bed space.

Quality Construction and Design

Built from ReliaSteel®, high-yield aluminized steel, this fuel tank offers superior durability and strength. It's powder coated black for a durable satin black finish, ensuring it can withstand the rigors of off-road adventures.

Dimensions and Compatibility

The tank measures 60-3/4" in length, 18-1/2" in width, and 18" in height. This tank is designed to not interfere with standard 5th wheel hitches, making it a versatile addition to your vehicle.

Automated Fuel Transfers

The TRAX 4™ system features computer-controlled automatic fuel transfers for worry-free operation. Based on the capacity of your pickup’s main fuel tank and the capacity of the Transfer Flow auxiliary fuel tank, the TRAX 4™ system transfers fuel at pre-determined levels from the auxiliary tank to the main tank while the vehicle is in operation.

Designed for Durability and Efficiency

This fuel tank is baffled on all four sides for extra strength and to reduce fuel slosh, ensuring a smooth ride even on rough terrains. It comes with all parts needed for installation, making it a convenient and efficient solution for your fuel needs.

Warranty and Support

Transfer Flow stands behind the quality of their products. This auxiliary fuel tank comes with a limited 6-year or unlimited mile warranty for your peace of mind.

Additional Features

This tank is recommended for drivers who need additional fuel capacity and a relatively compact tank design. It's perfect for those who value efficiency and convenience in their off-road adventures.


  • DOT Approved: DOT Approved For Direct Feed Into OEM Fuel Tank
  • Tank Capacity: 50 Gallon
  • Fuel Type: Diesel
  • Shape: Rectangular
  • Tank Length (IN): 60-3/4 Inch
  • Tank Width (IN): 18-1/2 Inch
  • Tank Height (IN): 18 Inch
  • Tool Box Type: No Tool Box
  • Tool Box Length (IN): No Tool Box
  • Tool Box Width (IN): No Tool Box
  • Tool Box Height (IN): No Tool Box
  • Finish: Powder Coated
  • Color: Black
  • Material: Aluminized Steel
  • With Locking Cap: Yes

    50 Gal
    Aluminized Steel
    60.75 in
    18 in
    18.5 in
    Powder Coat Black
    ltl shipping
    146 lb
    Locking Type
    Lockable Cap
    Liquid Type
    Transfer Flow Logo

      TRAX 4™

      Want to know the status of your on-board fuel systems? Simply download the TRAX 4™ app to your smartphone and enter your vehicle and fuel system information. In no time, you’ll be able to monitor your pickup’s fuel capacity!
      App Install Details
    • Unlimited Mile


      Transfer Flow fuel systems and parts 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.
    • Need Help?

      Fuel Tank Installers

      Transfer Flow has built an extensive network of 196 authorized installers throughout North America, all of which undergo thorough screening and have demonstrated the ability to install multiple fuel systems from each of our main product lines.
      Installer Map
    • Replacement Fuel Tank

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    • Auxiliary Tanks

      Automatically transfer fuel to the main tank with our exclusive AutoTrans® technology

    Transfer Flow Combo

    Toolbox & Tanks

    Discover the unbeatable versatility and reliability of our all-in-one auxiliary fuel tank and tool box combo, where convenience meets practicality in perfect harmony.

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