Hey, all.

I had a cracked evap canister, so I went to the junkyard and grabbed another. I installed it, but had problems filling the gas tank. It would fill a few seconds, then shut off.

So, I got home, pulled the evap canister, and blew through each of the three ports. Two of them had air flow in and out to each other, the third was blocked.

Checking the ops diagram, looks like that port runs to the intake manifold.

Should it be blocked (has a check valve or something), or should it have airflow?

Thank you.

Year, model of car, etc.

 

Could be a blocked tank vent; evap has nothing to do with filling. The evap system is closed by a valve actuated by the flap just inside the filler neck when re-fuelling.