I found the part on amazon.

Anthony, Thank you very much! So if the purge valve is stuck open ( vent to the outside world ). The fuel tank will not build up pressure and allow over flow into the charcoal canister. Is that a correct summary of the behavior?

I am going to tackle this repair at the end of august. Right now my car is driving well. I had already bought a new fuel pump and new fuel filter. Any advice on doing this repair to minimize gas spillage?