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How bad is the inside of the tank? Typical "sat a long time" heavy surface rust? Whatever you do, avoid using fuel tank sealer if you can. Once you use whatever de-rusting method you prefer (Vinegar, muriatic acid, etc) neutralize, rinse, and then fill it up with some MMO and slosh it around really well to help stop flash rusting. Once you drain the MMO back out, put the petcock and fuel float back in and fill it up with treated fuel - I personally love Marine Stabil, but regular Stabil works just as well. Tank sealers end up being more trouble than they are worth, and I have yet to see one that has held up over time.
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