Yes a spider nest in the line. The service guy at a legitimate Volvo dealership first asked me when I told him the symptoms, it I lived out in the country. I don't live in the country, but he proceeded to tell me that they have seen this problem before. I should have asked to see the nest that they took out of the line. They pulled the filler neck out and replaced a couple of o-rings while they were there and it fixed the problem. It seems that the fuel is slow to enter the tank, would this be symptom of a breather clogged (clogged charcoal filter). The odd thing is that it seems to improve if they car sits off for a few minutes before attempting to fill the tank.

-Seth