If the pitting is not too bad then the thing to do is get the west systems cleaning and etching kit and some epoxy primer. First clean the tank with soapy water and a stiff brush. Then sand the entire tank down and rinse it off. Then use the system 3 cleaner and etcher and prime the tank with the epoxy primer. I use Awlgrip epoxy primer. You only have a couple hours after etching to prime the tank before it starts to oxidize again. This should stop the corrosion. Every gas tank that I have removed that had the rubber strips had some corrosion under the strips. You can always pressurize the tank to make sure it is good before you dive into trying to save it.
strick
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