Trying to diagnose a P0457 code on the wife's 2014 Explorer 3.5L GTDI (ecoboost). Started as a warning on the instrument panel to check the fuel cap, which on this car is quite the joke since it has Ford's capless fuel filler. After a while the CEL popped and Forscan Lite shows a P0457 evap leak, likely the fuel filler cap. If I clear the CEL it stays off for a while but always comes back. Tried a little shotgun approach and replaced the charcoal canister vent solenoid; note the purge valve seems to work just fine. Tried the manual filler cleaning procedure which is much touted on youtube with no changes (I was very thorough). No odors or visible leaking of fuel. Some light conversation with the dealer and they swear up and down it can't be the fuel filler neck (well not CAN'T but 99.9% it isn't). Without a smoke machine I am kind of stuck, at this point my next step is to pop the right rear wheelwell out and visualize the filler neck and the vapor hose for obvious signs of damage or leaks. Might have to make a DIY smoke machine, though. I do have a Halloween fog machine would that work? I have some PEX tubing which fits the nozzle, but it seems like that fog likes to condense pretty rapidly.
Below are a couple shots from Forscan. Any thoughts?
P0457:
Below are a couple shots from Forscan. Any thoughts?
P0457: