Anything can be fixed but there is a product that coats gas tanks and the lines can be replaced or made up by a shop. It's not terminal but if you have to pay a shop it could cost a lot. THe tank has to be removed. It's a big job.

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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si