The ATI 66 Gallon Auxiliary Diesel Fuel Tank is a high-capacity auxiliary solution designed to extend diesel driving range while preserving functional 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. Constructed 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 delivers durable, American-made performance trusted by work trucks, fleet vehicles, and long-distance operators.