The ATI 51 Gallon Auxiliary Diesel Fuel Tank provides substantial additional diesel capacity for extended driving range while maintaining usable truck bed space. This auxiliary tank connects to the factory fuel system using a Gravity Feed Installation Kit (sold separately), allowing diesel fuel to transfer naturally into the primary tank without pumps or electrical components. Manufactured from premium aluminum, the tank is DOT approved for highway and commercial use , meeting and exceeding Title 49 CFR 393.65 requirements. Designed exclusively for auxiliary diesel fuel applications , ATI delivers rugged, American-made performance trusted by work trucks, fleet vehicles, and long-distance operators.