My issue on water entering the gas tank, which might help someone else.
On my 18' Kenner the "pie hole" cover was not sealed at the deck when manufactured (very sloopy production) even though it's a waterproof cover with an o-ring seal. Water was leaking down directly on the fuel gauge sending unit. After many tries resolving the excess water in gas issue, draining the tank twice and three or four Racors later, I figured out the water was leaking into the tank at the rubber gasket at the sending unit. Real simple, just put water on the high side of the gasket with an eye dropper and it disappeared under the gasket. Every time it rained or you washed the boat water was entering the tank. Some 5200 around the mounting base of the pie hole plus generous amounts of Permatex #2 on the sending unit gasket and no problems since!
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