I used a beer keg in the back of my 52 ford pickup. I had a bung welded on by a guy who worked alluminum, the other holes capped and had a late 70's jaguar flip top gas cap riveted on. Outside of the fact the keg i used had several dents the only problem i had was the constant splashing sound in the tank. I never set it up for any type of fuel gauge, instead i had a stainless rod i kept under the seat. The flathead seized up on me when i punctured the radiator and my uncle, the one who gave me the keg, begged it off me for to use on his case tractor.