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Hi Guys, I have the code, itd P0455. Wouldn't that explain the issue with gad filling?? Where should I start now?

P0455 is a "large vacuum leak in the evaporative emissions system"; often a bad gas cap, but could also be vacuum lines or valve issues in the EVAP canister system.

Does it has to do anything with my problem of refueling? The fuel pistol disengages itself after a liter or two being pumped into the tank....?

I also see that when I unlock the gas cap, inside the valve there is this little metal which unlocks itself when i put the pistol inside. Once i take it back it stays in that position and doesn't return to the the "close" position. is that natural? it sounds crazy put when i put my finger into this hole and push it it doesn't come back and stays ...lets say "open"

Should I replace it?

Many thank for Your help.

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I'll recommend having the system smoke tested again.

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The tank filling problem is attributed to a "venting" issue. As you fill the tank with a fluid, gasses must be displaced from the tank to allow the fluid to enter the tank. If for some reason one of the tank vents or the carbon canister is plugged or any vent line line restricted, the fuel volume from the fuel filling station will stop. Check all the venting lines and the carbon canister for restrictions.

Since you did some work to the engine and likely had the battery disconnected, you need to readapt the throttle body.

On the last Cayenne that I replaced the cooling lines under the intake, I used the Ross-Tech VCDS to adapt the throttle body in:

Basic settings 060 Key On Engine Off (throttle at rest) and at 063 Key On Engine Off (at wide open throttle)

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