I had my shop replace the canister and they had to blow out the lines, they were full of charcoal beads, and stopping the fuel from going into tank, the shop told me from now on, don’t top off the tank, when the fuel nozzle pops, fill to the next dollar and stop….

2004 H2
2006 H3

 

Something is lost in translation here.

The charcoal canister is tiny, and has a tiny line.
It is not inline with fuel delivery.
The filler neck is huge.
How would a bit of charcoal in the filler neck that was washed out of the charcoal canister stop gas from getting into the tank?
How can it completely plug up a filler neck? The charcoal dust/beads/tiny chunks would just wash down into the tank.
How could it plug up the filler neck?

Makes no sense to me. What am I missing? Please help me understand.

 

The canister absorbs fuel vapors while filling, when plugged vapors would flow out the filler neck causing the pump to shutoff, as it does when the tank is full.

 

finall... he had to blow out the evap lines not the fuel filler.
i am guessing thats what your concern was?

 

Yes, that was my confusion. Thanks for clarifying. Makes complete sense. I thought he meant fuel line. Not sure why I read it the way I did :0