2002 S500 Mercedes Benz back splashes fuel and leaks fuel from charcoal canister on 2002 Mercedes-Benz S500

Whenever I start the engine and allow the vehicle to idle it leak fuel from the charcoal canister.

Asked by for the 2002 Mercedes-Benz S500
Overfilling your gas tank can be a common problem for this. Check your pressure senor and shut off valve
Where would the pressure sensor be located? and are shut off valve