Gas filling

Hello, it sounds like a ventilation concern with your fuel tank, possibly related to the evaporative emission system. This will need testing performed to find out what may be faulty here.

This may or may not be applicable here - however I suspect it has been at some point. It is best practice to avoid overfilling or *topping off* the fuel tank when refueling - that can damage EVAP system components - as ambient temperatures rise and fuel expands - it can force raw fuel into the system - IF tank is over full. Just a side note.