5 years later, replace the fuel tank or clean it?

72 Demon said

Personally, I'm leery of putting a coating in a gas tank. Many motorfuel contain ethanol. Ethanol can be unfriendly to fuel system components depending on % of content in the fuel and how long it is used. If the coating isn't specifically impervious to ethanol, I'd avoid it.

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We have done several tanks like this over the last couple of years and haven't had any fuel related problems. We don't use any ethanol though. There is a product called Kreem, that motorcycle guys swear by.

http://www.kreemproducts.net/

The car and truck kit looks pretty nice for $65, even comes with a flexible light and mirror to inspect the tank.