I dont have a loop in mine and it seem to be ok. It might be the opposite and moving the loop down lower would solve the problem. My thinking is that gas is in this loop. When you stop the gas (in the tank) shifts foward forcing air up the hose and this is pushing the gas in the loop out the vent. If it was lower the gas in the loop would have futher to travel and not blowing it out the vent.
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