Could be something in the tank that when it gets to a certain level it sucks it up. when you fill the tank again it floats to high to get stuck, I also took out my little ball that was in the line to stop the siphon and it took care of mine. Also on the Sea Ox I had a loop in the vent line, if it gets kinked or filled with fuel it will block the vent.
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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