Is it the gas nossle kicking off? Are you seeing gas overflowing up the fill tube on your car? 2 very different problems. 1 is high pressure because ,maybe you are the only one using that product an getting full pressure from the motor suppling fuel at that pump. 2 could be a cut off at the bottom of the fill tube, but it is suppose to completely shut off the tank in case of accident. We've had discussions of this on here before.