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Questions? Call or Text our US based team: 800-964-5341
Questions? Call or Text our US based team: 800-964-5341

Auxiliary Fuel Tanks for Sale

We offer a full line of Auxiliary Fuel Tanks for sale.  Choose from sizes that start at 30 gallons and increase up to 110 gallons.  We offer a variety of designs including rectangle, L Shaped, wedge, and low profiles. 

Auxiliary fuel tanks allow you to transfer diesel fuel directly into your truck's factory gas tank.  We do not sell Gas Auxiliary Fuel Tanks.

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    Transfer Flow 75 Gallon Auxiliary Tank
    $1,889.76 - $2,177.82
    $1,889.76 - $2,177.82
    $1,889.76 - $2,177.82
    $1,889.76

    Transfer Flow In-Bed Auxiliary Fuel Tank System

    Transfer Flow

    The Transfer Flow In-Bed auxiliary fuel tank is designed to be compatible with almost any diesel truck, including half-ton pickups, trucks with uti...

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    $1,889.76 - $2,177.82
    $1,889.76 - $2,177.82
    $1,889.76 - $2,177.82
    $1,889.76
    ATI AUX30R auxiliary fuel tank Save up to 15% Save %
    $675.00 - $776.47
    $675.00 - $776.47
    $675.00
    $573.75 - $660.00
    $573.75 - $660.00
    $573.75

    ATI Rectangular Diesel Aluminum Auxiliary Tank

    Aluminum Tank Industries

      Aluminum Tank Industries rectangle aluminum auxiliary fuel tank is available in sizes that range from 30 gallons to 55 gallons.  These light weig...

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    $675.00 - $776.47
    $675.00 - $776.47
    $675.00
    $573.75 - $660.00
    $573.75 - $660.00
    $573.75
    Save up to 15% Save %
    ATI AUX58R auxiliary fuel tank Save up to 15% Save %
    $801.47 - $864.71
    $801.47 - $864.71
    $801.47
    $681.25 - $735.00
    $681.25 - $735.00
    $681.25

    ATI Diesel Aluminum Auxiliary Tank

    Aluminum Tank Industries

    Aluminum Tank Industries rectangle aluminum auxiliary fuel tank is available in sizes that range from 51 gallons to 66 gallons.  These light weigh...

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    $801.47 - $864.71
    $801.47 - $864.71
    $801.47
    $681.25 - $735.00
    $681.25 - $735.00
    $681.25
    Save up to 15% Save %
    ATTA Sleeper Diesel Auxiliary Fuel Tank 110 gallon closeup
    $1,683.00 - $1,683.00
    $1,683.00
    $1,683.00 - $1,683.00
    $1,683.00

    ATTA Sleeper Diesel Auxiliary Fuel Tank

    ATTA

    The aluminum ATTA Sleeper Diesel Auxiliary Fuel Tank is a 110 gallon rectangular aluminum auxiliary fuel tank designed to fit underneath a truck b...

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    $1,683.00 - $1,683.00
    $1,683.00
    $1,683.00 - $1,683.00
    $1,683.00
    Transfer Flow 40 Gallon Under Tonneau Cover Auxiliary Tank
    $1,745.26 - $1,870.62
    $1,745.26 - $1,870.62
    $1,745.26 - $1,870.62
    $1,745.26

    Transfer Flow Low Profile Under Tonneau Auxiliary Fuel Tank

    Transfer Flow

    The low profile Transfer Flow auxiliary fuel tank is designed to fit under tonneau covers.  Choose from 40 or 50 gallon sizes. Either option offers...

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    $1,745.26 - $1,870.62
    $1,745.26 - $1,870.62
    $1,745.26 - $1,870.62
    $1,745.26
    Fuelbox FTC44T under tonneau fuel tank toolbox combo
    Save up to 12% Save %
    $2,159.00 - $2,299.00
    $2,159.00 - $2,299.00
    $2,159.00
    $1,900.00 - $2,135.00
    $1,900.00 - $2,135.00
    $1,900.00

    The Fuelbox Under Tonneau Fuel Tank Toolbox Combo

    The Fuelbox

    The Fuelbox Under Tonneau is a low profile fuel tank toolbox combo.  This fuel tank toolbox combo is designed to work with most tonneau covers. Th...

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    $2,159.00 - $2,299.00
    $2,159.00 - $2,299.00
    $2,159.00
    $1,900.00 - $2,135.00
    $1,900.00 - $2,135.00
    $1,900.00
    Save up to 12% Save %
    Transfer Flow 40 Gallon Auxiliary Tank Toolbox Combo
    $2,467.73 - $3,293.60
    $2,467.73 - $3,293.60
    $2,467.73 - $3,293.60
    $2,467.73

    Transfer Flow Auxiliary Fuel Tank Tool Box Combo

    Transfer Flow

    The Transfer Flow auxiliary fuel tank and toolbox combo is the best of both worlds, providing more fuel and secure storage for all your adventures....

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    $2,467.73 - $3,293.60
    $2,467.73 - $3,293.60
    $2,467.73 - $3,293.60
    $2,467.73
    The Fuelbox FT47 closeup
    Save up to 15% Save %
    $1,747.00 - $2,029.00
    $1,747.00 - $2,029.00
    $1,747.00
    $1,485.00 - $1,725.00
    $1,485.00 - $1,725.00
    $1,485.00

    The Fuelbox Auxiliary Fuel Transfer Tank

    The Fuelbox

    The Fuelbox Auxiliary Fuel Transfer Tank is an in bed diesel fuel tank. Choose whether you want to use this fuel tank as a transfer tank or an auxi...

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    $1,747.00 - $2,029.00
    $1,747.00 - $2,029.00
    $1,747.00
    $1,485.00 - $1,725.00
    $1,485.00 - $1,725.00
    $1,485.00
    Save up to 15% Save %
    ATTA Auxiliary Tank Toolbox Combo in pickup bed
    $1,504.00 - $1,504.00
    $1,504.00
    $1,504.00 - $1,504.00
    $1,504.00

    ATTA Diesel Auxiliary Tank & Toolbox Combo AT50TT

    ATTA

    ATTA Diesel Auxiliary Tank & Toolbox combos provide an ideal solution for securely storing a 50 gallon auxiliary fuel tank and a toolbox in an...

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    $1,504.00 - $1,504.00
    $1,504.00
    $1,504.00 - $1,504.00
    $1,504.00
    Diesel Auxiliary Under Toolbox Tank 30 Gallon
    $1,024.00 - $1,024.00
    $1,024.00
    $1,024.00 - $1,024.00
    $1,024.00

    ATTA Diesel Auxiliary Low Profile Under Toolbox Tank

    ATTA

    The aluminum ATTA low profile under toolbox fuel tank is designed for short beds only. The Under Toolbox fuel tank is designed to work in conjunct...

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    $1,024.00 - $1,024.00
    $1,024.00
    $1,024.00 - $1,024.00
    $1,024.00
    $893.00 - $1,444.00
    $893.00 - $1,444.00
    $893.00 - $1,444.00
    $893.00

    ATTA Rectangular Diesel Auxiliary Fuel Tank

    ATTA

    ATTA rectangular diesel auxiliary fuel tanks are designed with .125 aluminum gage and are available in sizes that range from 40 gallons to 110 gall...

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    $893.00 - $1,444.00
    $893.00 - $1,444.00
    $893.00 - $1,444.00
    $893.00
    ATTA Below Bed Rail Diesel Auxiliary Tank 45 gallons
    $938.00 - $1,359.00
    $938.00 - $1,359.00
    $938.00 - $1,359.00
    $938.00

    ATTA Low Profile Below Bed Rail Diesel Auxiliary Tank

    ATTA

    ATTA Low Profile Below Bed Rail rectangular tanks are designed to be used with a hard or soft bed cover. The highest portion of the tank will be b...

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    $938.00 - $1,359.00
    $938.00 - $1,359.00
    $938.00 - $1,359.00
    $938.00

    Auxiliary Fuel Tank Resources

    See our guide to the best Auxiliary Fuel Systems.

    Unsure of the Best Tank Size? See our Auxiliary Tank Size List by Brand: