Meanwhile, I'm replacing the fuel line vent valve on a car that spits out gas when you try to fill it. I hope you don't mind if I add this here for future reference to the evap system for others who end up here.
This tech article is on the 996 section of the PelicanParts DIYs, but it is identical to the system on my '01 986:
https://www.pelicanparts.com/techarticles/Porsche-996-997-Carrera/106-FUEL-Replacing_Your_Fuel_Line_Vent_Valve/106-FUEL-Replacing_Your_Fuel_Line_Vent_Valve.htm
Video included on that page:
Maytag - I'm going to be pulling the evap system out of a parts car (low flood damage). Let me know if you want any cheap 'probably good' parts from an '01.