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Big Lew is absolutely right - All Moesly/Potter vintage SeaCrafts ventilate the bilge BECAUSE OF THE FUEL TANKS! One of the early Potter brochures said it cost them more to do that, but was required because they didn't foam in the fuel tanks, as was done on cheaper boats! (All knowledgeable surveyors agree that foaming in the fuel tank is a BAD idea, as the foam can hold moisture against the aluminum, greatly increasing corrosion rate!) Moesly had it right. Ventilating the bilge will prolong the life of everything in there - tanks, wiring, decks, etc.
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Not the 18's Denny. Their tanks are in an unvented box below deck. Seems kind of strange to not vent a sealed compartment containing a fuel tank. When I installed a 60 gallon tank, I cut out the front wall of the compartment to accept the longer tank. Should I vent my hull? The bilge does have a wet, musty smell to it.