If you are going to use your original tank and it has flash rust in it, it needs to be cleaned and coated. There are high power cleaners specifically for that purpose. A trick I learned a while ago is to put a bunch of washers or nuts into the tank with the cleaner and shake it for a while... that helps get all the rust and gunk to let go. Then rinse it thoroughly. After you get it clean and rust free, you will need to coat the inside with a special sealant. There is a Trucks episode on a '65 c10 project they did that talks about this as well.
Last edited by cletis; 10/15/2009 2:15 AM. Reason: language
