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From personal experience with a contaminated fuel tank (1979 22 ft. Revenge) clean up the fuel tank now that it is accessible. I see that the boat has an above deck tank. Is that because the previous owner bypassed the deck tank? Al was fortunate. On my Revenge the fuel tank deck cover extends underneath the cabin. Have a shop cut in some 4 inch or 6 inch holes fore and aft (either side of baffle) and get a couple of access plates. Future maintenance on the tank could then be easily done in place. You could also check out the drainage.
gchuba