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Q: gas pump shuts off prematurely and often on 2001 Subaru Impreza

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When I pump gas the gas station pump frequently shuts off in the process. I replaced the Filler Pipe, Valve and flange nut because these parts were rusted. Cost $306. The problem persists. Did I throw $300 down the drain. What can be done to fix the problem ?
(1) Answer
It is most likely your roll over valve, which is not letting out the displaced air as you fill the tank. It may be rusted shut.