Question about Cars & Trucks
By pass pipe crimped or blocked, most tanks have a pipe from the top of the tank to the neck of the filler to allow air to escape from the tank as the fuel is put in. If the pipe gets blocked, air has to come back up the filler pipe and it bubbles the fuel and backs it up to the filler causing the pump to knock off. Hope that helps.
Posted on Dec 28, 2013
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Posted on Jan 02, 2017
ONE THING YOU CAN CHECK IS THE SCREEN INSIDE THE FILL NECK BUT YOU MUST REMOVE THE TUBE THAT IS ON THE TANK. THERE IS A STRAINER ON THE BOTTOM OF THE TUBE THAT NOT ONLY PREVENTS SIPHONING OF THE FUEL BUT KEEPS DIRT AND LARGER PARTICLES FROM REACHING THE INSIDE OF THE TANK. IF THIS IS CLOGGED IT MAY HAVE BEEN VANDALS OR EVEN SMALL CHILDREN AT PLAY. IF THE CLAMP THAT HOLD THE NECK TO THE BOTTOM OF THE TANK IS THE CRIMP-ON TYPE THEN CAREFULLY CUT IT OFF THEN REPLACE WITH A STAINLESS ONE THAT CAN BE REUSED. HOPE THIS HELPS YOU. VERY CURIOUS TO KNOW. BUT EMISSIONWIZ KNOWS HIS STUFF SO I MAY BE WAY OFF. GOOD LUCK
Posted on May 08, 2009
SOURCE: problem filling gas tank
Sounds like you need a new filler neck. There is a vent, and it is part of the filler neck. Or there could be a bad valve at the bottom of the neck.
Posted on Jun 12, 2009
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