I knew to leave if their dumping fuel, but the wal-mart MurphyUSA I go to,if I get there while their setting up, It's puts me to close to the fill port the way the pump is set up, so they can't start till I finish filling up.
But if I get there and there dumping I leave and go pay a higher price down the road, it's cheap insurance, even with the bigger filter's and water trap on the Air Dog, I don't want to take the chance.