I'm not sure what this could mean, but when I'm fueling up, If I either:
a.) Put the gas nozzle in all the way, or
b.) Press the trigger in all the way..

The gas will stop going into the tank, and will spill/spray back out at me.

What could that be?

 

its pretty common, either clogged vent tube, or i believe you can buy an upgraded larger filler neck. or just deal with it

 

Since it's common, I'm not going to worry about it.

Thanks.

 

Yep, mine does it too and several others have said their does it. Front tank, right?

 

Most likely vent tube......it does get annoying.....