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Ok, THANKS! I guess you guys saved me from creating a real mess and an expensive one!
As far as any other likely sources; the pan under the engine is clean and dry, no mess on engine; no obvious leaks at Racor.
The bilge is very deep at the back. I have 2 electric bilge pumps. Their pickup is under the fuel tank or slightly forward of it, not the lowest point. The manual bilge pump's pickup IS at the lowest point. It is only from this pump that I get the sheen. The fuel tank sits in the bilge on timbers made out of ?? to keep it up out of the water. Process of elimination seems to point to there being a pinhole leak in the tank or possibly in the fill hose, hose to Racor, vent line (doubtful), or resulting possibly from inadvertant spillage when changing filters. Or maybe around since before I owned boat since it seems hard to readicate with throwing cleaners down the bilge.
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