Actually we have warned or fuel expansion many times on this site. The boat was probably sitting nose up, and once the fuel traps the fill and vent, it has to come out. Dropping the nose to a level position from nose up should lower the issues with this. We put a warning up on htis site going into summer from winter and cautioning those on here about heat in garages and such. It is a major concern to us and everyone with fuel tanks in a garage sitting. We have often referred it to a vehicle as you burn fuel when you drive your car after filling it. Plus we dont usually pack our cars fuel tanks. If we do, then they too leak out. Which was a common occurrence on dual fuel tanks in the 70s and 80s on pick up trucks. You do not drive your boat home and burn any fuel off hte top, thus it gets more complicated and compressed. Try this and also dont top them off. Fuel expansion from heat is critical. Last week one of my teenage sons put the gas can on the back patio in the hot sunlight. Thus we experienced a similar issue from tremendous heat expansion. The issue is more complicated when there is air in the tanks, which turns to fumes that have more compression from heat expansion. And those fumes are able to be trapped in the tanks at different angles and levels. The fumes have more pressure from expansion than one might think. Hope this answers some of your question and try dropping that nose some. Rick BCB
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