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 ?

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.