The 2006 to 2008 4 seaters had the filler cap on the side panel and later ones had it inset and more in line with the hose to tank. When my 4 seater went back to the factory they changed the hose and improved the flow. Nozzle at 2 o'clock fills the tank.
I am surprised that 2 seaters have problems as the filler is pointing up. Having said that my friends +8 had 2 fillers which indicates a pressure problem. I told him that it was because it drank twice as much fuel!
