The ATI 41 Gallon Auxiliary Diesel Fuel Tank is a mid-capacity extended-range solution designed to increase diesel fuel capacity 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 the use of a pump. Manufactured from premium aluminum, the tank is DOT approved for highway and commercial use , meeting and exceeding Title 49 CFR 393.65 requirements. Engineered specifically for auxiliary diesel fuel applications , ATI tanks deliver dependable, American-made performance for work trucks, fleet vehicles, and long-distance hauling.