If a little gas has gone down the vent hose, it would slam the rollover vent at the end of the hose shut. Also, the hose is really easy to pinch closed.
An off chance, you can see the tube the hose attaches to on the right side of the filler neck, make sure that a bit of paint hasn't come loose from the neck and blocked the vent tube.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python