We had an 04 XC70 that would be difficult to fill at the Gas station. After many conflicting theories I came across on this site, I decided to try one I found. The filler neck has a slender hose running up towards the fuel inlet. I detached this hose at a connection point while lying under the car and blew one strong blow from my mouth into the hose. Much resistance at first then it popped and was clear. Never had a fill problem after that. The theory is the some bug has nested in this location although that seems a strange place to build a nest. Fumes.
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