Quote:
Originally Posted by Fast Corners
I have seen the plastic tanks collapse because the vent was not functioning. Eventually the pump dies from trying to overcome the suction. If this happens again, open up the gas cap and listen for a rush of air into the filler neck. Another symptom of this is the fuel gage starts reading funny.
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If the tank venting system is not functioning, you will have a hard time to fill up the tank to full. The head space will be trapped and air inside the tank can't escape.