I had a P0455 or 453 (large evap leak), which I fixed. Long story short the hoses to and from the purge shut off valve were both seriously cracked. Both were replaced. I reset the code ant took the car for a test drive - 20 mile or so, no check engine light - i'm a happy camper

During the drive I stopped to fill the car up with gas. While filling I noticed gas trying to spill out of the fill tube but I could press the nozzle tight enough(rubber thing on it) so gas didn't keep spilling out. This happened just a few seconds after starting to fill the tank - I ended up adding something like 16 gallons.

This morning I went to fix a trunk switch issue and I moved the car and now the check engine light is on aqain. This time it's a code P0452.
Ideas?

 

I would check more vacuum lines. Has the PCV been replaced recently?

 

I'll keep checking. I haven't done anything with the PCV. Oddly, since I reset the check engine light *again*, the light has not come on.

 

check the valve under the drivers inner fender well. common leak point. Also. You have the evap box by the gas tank.