frequent shut off of gas pump 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 ? One answer posted said to replace the roll-over valve. If that is the one at the end of the filler pipe, I already replaced it. I know of no other valves related to gas filling. Can anyone please help me solve this mystery ?
(1) Answer
(2) Comments
The mystery has not been solved but I worked my way aroundthe problem. It wasn't plugged, I insert the gas pump at an angle and the problem goes away.