2009 MKX 3.5 check gas cap light issue with intermittent check engine light with P0455
Replaced gas cap. Lights were off. Got fuel a few days later and gas cap light came on the next day. It stayed on for a week and went out. Check engine light came on 2 days later with a P0455 code. Cleared light and all was good for a week. Check engine light returned and I cleared it again. Light was off for a few days and returned a day after getting fuel.
Ive checked the purge valve by disconnecting the line and the wiring harness and running the car. It had no vacuum and I believe that means its good.
I do have a smoke machine and tried smoking the fuel filler pipe. Checked underneath and didn't seem like and smoke was escaping. Having a hard time with trying to find a spot to hook the smoker to on the EVAP lines under the hood. I did try smoking the inlet line that runs from the purge valve to the charcoal canister/fuel tank. It seemed to have a leak on the passenger side in the middle? That didn't seem right to me.
Has anyone had the gas cap light/ check engine light issue like this? What was your fix for it?
Thanks in advance
