I normally stay on the bike to keep it leveled as I pump. I learned a long time ago while filling up a 1 gallon can that the pumps at my preferred gas station pump way fast and will make a mess on cans and small tanks so I have made it a habit to squeeze the nozzle up to half way at most to pump slowly. I have been able to consistently get 6 bars and I have never had gas splash all over the tank.