Join Date: Jun 2001
Location: Wilson, NY
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gasoline below deck
As a 30 year user of gas powered sailboats I concur w/ Jeff on using a blower even when the engine is running. I go one step farther and sniff the bilge when I first come on board after the boat has been closed up. This is before I turn on anything. If a leak developes while the boat is closed up, one could count on plenty of fumes in the bilge.
I would be concerned about a portable/outboard style can inside the cabin area. Too many things could disrupt a tank that is not permantly and solidly mounted. If you have a mounted tank, I would look for a way to at least somewhat seal the area off from the cabin. Certainly, it is imposible to make that seal vapor proof, but anything would be better than just being open to the cabin. I know I like to smoke a cigar now and then, but I won''t do it when my engine compartment is opened up into the cabin.
Not only should you have the blower/vent, but you should also have a passive system that includes a vent to take air in while the blower vent allows air to go out even when not running the blower.
I have more thoughts on this, but I have gone on enough.