I have bought two CJ replacement gas tanks, both reproductions made of steel, and I have had problems with leaks on both of them. The one I installed in my CJ2A leaked around the bung for the fuel line fitting. I drained and pulled the tank and put a light inside. There was a big gap between the bung and tank. I fixed that with some Permatex sealer made for gas tanks. The one I installed in my CJ5 seemed okay at first, no leaks for the last couple of months but the tank was only about half full during this time. Last week I drove it into town and filled it up at the gas station. By the time I got home the floor board was covered in fuel. It is leaking around a seam. I can fix it, but it really bugs me these things are no better than this. I am now considering a plastic tank with a pickup on top. I see one out there made in USA, "MTS" brand, which is made of 1/4" High Density, Cross-Linking Polyethylene. I don't like the idea of a plastic tank, but I like it better than a crappy foreign made steel tank that leaks. Anyone tried one of these Poly tanks ? I am also considering an aluminum fuel cell mounted in the cargo bed, but leaning more towards the under seat plastic tank to leave more room for gear in the bed.