Does anyone know where this is located?

Fuel Tank Vapor Control Valve for charcoal canister
996-605-203-01-M244

Not sure where exactly it's located. Is it in the front passenger wheel well near the fuel filler vent valve? The symptoms I am having is gas smell in the car and lots of pressure when the gas cap is opened along with the check engine light. I forgot what code it was as I bought the part last year and not even really sure this will fix the issue. Saw a diagram showing that it is possibly located/connected to the fuel tank. How do I access this? Another thread mentioned that the entire front end had to be dropped to access the tank? WTH? My car is a C4 btw.

Also read a post regarding someone replacing this on a Boxster but he mentioned there were 3 separate valves? Man I'm confused.

http://986forum.com/forums/diy-proje...rol-valve.html