motor and gas

[Capt Chuck]

If you don't have a check valve on the tank . . . then your vent (on the TANK) is blocked.

Right-On Tim!
Since he lives in Fl and by chance his SeaCraft has been sitting around, I'll betcha one of those Mud Dobber Wasps built a nest in the vent line

BTW: You need to keep the "O-Ring" on the fuel fill cap lubricated. The gas will dry it out and crack. Then every time you wash you boat or it rains, guess what enters the fuel tank