Check out the Motobilt behind the Seat Fuel Cell w/ -AN Fittings And Mount for Jeep YJ. This tank is industry leading in that is was designed specifically for the YJ to maximize fuel capacity while retaining the rear seat. Motobilt offers a solution for relocating the fuel tank in your Jeep YJ. There are a few universal options available like the popular RCI 2161a which is basically a rectangular aluminum fuel cell. It was not designed specifically for the Jeep YJ. The Motobilt Jeep YJ fuel tank was designed to fit behind the rear seat and maximize the space behind the seat. It is actually contoured and angled to fit behind the seat. The tank has a capacity of roughly 18 US gallons.
