Fuel tank level must be below about 85% full before any leak detection processes are invoked. Before firing the "parts cannon" and replacing the fuel filler cap, try this test. Remove the filler cap. Securely tape a small, thick vinyl sandwich bag over the filler tube opening and seal it completely. Erase the diagnostic code. Drive the vehicle for a few days. Does the code return? If NO then you isolated the problem to a poor seal with the fuel cap. If YES, then the problem is NOT the seal at the fuel filler cap and lies elsewhere.. . . I've gotten this code twice in a month, both times it seems to happen when the tank gets down to half. Thinking of buying a new gas cap just to see if that helps, if not have to dig deeper. Any other ideas? . . .
Are you getting code P0456, small evaporative leak?. . . I've watched several videos and since the car has 170,000 miles, thinking of replacing the purge valve. . . .
You do not lower the fuel tank to check the vapor canister and its filter. I made an assumption that a 2007 PT Cruiser would use ESIM for vapor emission control. But it is possible that it could have an older system called NVLD (natural vacuum leak detection). Find the vapor canister under the car and near the fuel tank. See attached image that shows ESIM and NVLD. ESIM has 2 hoses attached and the ESIM device. NVLD vapor canister has 3 nipples with hoses attached. Which do you have?. . . To check this, does one need to lower the fuel tank? . . .
I sent you a PM with a link to download a copy of the Gen2 service manual from my Google Drive, it should help with your troubleshooting.I have the car up on ramps under rear wheels, seems on passenger side I have found where the hoses are at.
I'm going to have to try to remove something to try to get access to that hose.
Looking in Haynes manual for PT Cruiser, it appears the filter is bolted down to the top of the tank.
However that might be the other style, the manual is vague.
It gives instructions on removing natural vacuum leak detector, no pictures.
Going to try removing whatever is in the way to gain access to hose.