gas pump shuts off prematurely and often on 2001 Subaru Impreza

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 ?

Asked by for the 2001 Subaru Impreza
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.
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