115 vent issue

[knukey]

What does it mean when you go along the motor dies and the primer bulb is sucked in? Fuel blows out of the vent lines during fill up so I cannot see how it is not venting properly, but the bulb expands if I loosen the filler cap. What could be wrong here?

Thanks guys.

[boats.net]

Possible a knicked vent hose