Having some trouble cleaning the rusty gas tank on a 77 Newport. I know this is probably the most-discussed topic on the bulletin board but I've searched like crazy and not found the answer. Here's what I did:
Filled the tank with a solution of hot water and phosphoric acid and let it sit overnight.
Emptied that out, then filled it with baking soda-water solutioin and let it sit a few minutes.
Dumped it out, then flushed with water several times.
Dried it with a blow dryer.
The problem is, it re-rusts IMMEDIATELY when I dry it.
Am I doing something wrong? Anybody know how I can prevent it from rusting?