1999 Camaro Evaporator Emissions Canister

My grandson has a 1999 Camaro 3800 V-6 engine, which him and I do most of the work on. He has an issue fueling the gas tank it takes forever. I have a repair manual that tells me the Emissions Canister is under the left rear fender. Well it is not there and I need help finding it. Can someone help?

The problem is not the evap canister. There is a check-valve in the fill-pipe, a simple ball in a cage, that is stuck in the closed position…