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I have 1987 Revenge 25'. Gas tank is aluminum 140 gals. I have noticed some what leaking off bottom 2 lag bolts under boat that bolt whale drive to stern. I removed the deck plate to expose gas tank and found the foam holding water. I have cut down into foam in 4 different areas to a depth of 8" or so the lower 4" is where wetness is found. Not real sure where all water is coming from top side or hull. Looking for help to understand and resolve. Thanks for your interest.