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Out the cap....but not the vent......why?

BH1166

Well Known Member
Tank is full in hottt hangar. No gas coming out of vent, but if I crack the cap, it percolates out. Why is it not coming out of vent line ��. I have seen venting when outside in direct sunlight. Ran both tanks down to 6 gallons each yesterday, so doubt vent is occluded/ blocked
 
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There is a small expansion volume in the tanks outboard of the fuel cap. The fuel can expand to above the level of the cap but not quite to the level of the vent, thus fuel will come out when the cap is removed.
 
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