What I don't get is why when he pulls the gas cap pressure dosnt release, system should be sealed til he removes the cap. My evap is deleted in tune and I build pressure sometimes when the tanks super low. I get a half second psh as I remove the cap. Is there something else inline between the filler neck and tank on the newer cars?

I tried sticking a coat hanger down the filler neck and it hits a brick wall. But it will still take fuel after the car sits for a bit.

Tried doing so with fuel in the neck?

Yea I tried it with fuel in the neck and when it took the fuel into the tank. I also tried testing my evap purge solenoid valve. I put power to it but it didn't do anything.

take filler neck pipe/hose off? look inside. white plastic ball should be floating free in its cage?

thinking something is obstructing the opening in the neck into the tank?

If so thats where I was going lol

yeah if not that then plugged evap can. removing neck is a lot easier.

Even if the evap can was plugged wouldnt it still release pressure when he removed the cap? Or am I missing something

Alright PROBLEM SOLVED!!!! I tested my evap purge solenoid valve (the one under the hood) yesterday and it didn't do squat. So I said screw it and went out and bought a new one this morning, threw it in in the parts store parking lot and the CEL went off about a 1/4 mile down the road. I then went straight to a gas station and she took gas no issues and I drove probably 25+ miles after that out to Thompson Speedway to check out the new road course (which is extremely badass BTW) no CEL.

WOW WTF!?!?!?! Never seen that. that one is getting stored in the memory bank!!! good job!

That's what I said! Haha friggin pos! But thanks for all the help guys! I love this forum. I posted this same thing on ls1 tech and only got a few replies and none were really helpful.