Fuel filling FIXED! the problem with this 02 996C was you could not fill tank with fuel at all! no matter how you angled the filler nozzle. There is two valves involved with venting the fuel tank when filling, the valve that was the problem here was 996.605.203.01 that lives on top of the fuel tank, when the fuel nozzle is inserted this valve and the another valve should click! they are on the same circuit.
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Replacing Your 996 Fuel Line Vent Valve / Bleeder Valve - Porsche 911 Carrera & 986 Boxster - Porsche 996 Carrera (1998-2005) - Pelican Parts Technical Article