I have a 2005 GW 232 with twin tanks (Aux and Main) that have Perko gas caps. More than one occasion if I fill the tanks up to the top the pressure will allow some of the gas to leak out from the caps and down the side of the boat and in the water. Especially from the Main gas tank. From reviewing the manual it appears that the gas vents at the base of the gas fill. I have put on two new gas caps and new rubber o rings. Anyone else experience this issue?