I have this passat and I’m struggling to fix evap leaks. I have replaced:
Leak detection pump
Drop the fuel tank and reseal the the part where the fuel cap connects to.
I also smoked the car to find leaks and I sealed everything I could see. Yes I smoked every evap line and fuel tank. All the patches and things I replaced helped to remove some codes but I still get: p0456 and p0441. Sometimes I get a warning light the fuel cap is not on but it is. New fuel cap too!