if it is too bad, you would probably be better off getting a new tank, I found it cheaper than having it boiled out and sealed. Around here they charge something like $250 at a radiator shop, at least all the places I called. I replaced all the fuel lines. If you find a glass top pump, there is a very fine suction screen, which will help with the stray rust bits. I got chunks from the filler neck, which just had some surface rust mostly, but at least one big enough to stop my fuel pump. You need a filter of some sort before the carburetor. It seems the new gasahol can damage some types of rubber, be mindful of that when choosing components.
