Fuel Leak
I had the same thing when I toped my tanks this past winter. We pulled the cover off the top of both inboard tanks. We found the gasket shrunk on inspection cover on top of both left & right inboard tanks. The screws where all loose in covers. We took both gaskets off. They where cork & still soft & in good condition. So we put a aircraft type sealer on gaskets & put them back on. We waited until next morning to put fuel back in. That gave the sealer time to dry. By the way my ship is a 1978 G model.
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