The ATI 43 Gallon Auxiliary Diesel Fuel Tank provides additional diesel fuel capacity while preserving practical truck bed space. This auxiliary tank connects to the factory fuel system using a Gravity Feed Installation Kit (sold separately), allowing 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, fleets, and long-haul operators.