Quote:
Originally Posted by tangofox007
As oldiesel correctly stated above, the tank vent system incorporates a relief valve which actuates at a slight pressure differential, both positive and negative. That means that some degree of pressure differential is perfectly normal.
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Back when I owned my little gasser accord I had a huge vacuum problem in the tank. One of the things I noticed rather quickly in my Benz was a hiss when I did my fill up.
I waited until the next time and let the car sit an hour. Still a hiss so I did the wire method and I guess I pushed the sludge back into the tank since I don't have any suction when I remove the fuel cap.