Issues Filling Gas Tank-Large Burp Blows Gas Back Out Filler

[lyonboarder 4]

2007 Centurion Avalanche.  Lately when fueling, I seem to be getting a large air bubble in the tank.  Something is not venting properly.  Fuel will shut off.  If I move the boat a little, I get a large "burp" and a LOT of gas spills back out the filler.  I can then put in several more gallons of fuel.

Where does the gas tank vent while fueling?  Maybe my vent is plugged.

This also started when I began using ethanol free fuel which seems to bubble up more then other fuel.

[Jake707 171]

On my Elite the filler is on the driver side in front of the windshield above the rub rail, below the rub rail in roughly the same area is a black circle cap that is the gas vent. Pretty much every time I fill up the boat with gas as Im taking off I get gas that splashes out of the that vent. I fill till the pump clicks just once but no matter what it comes out while pulling away.

Do you have the same vent cap below the rub rail? If so take a look at it and make sure its not plugged up maybe?