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Fuel Venting System 2003 C4S

Fuel System

Model: 2003, Year:C4S, Mileage:35000, Type of use:Street use only
I think your archive has answered this already, but can I ask is there a solenoid on the small metal flap inside the fuel filling nozzle, that activates the venting system?The reason I ask is because yesterday I was unable to put gas in my car - it would reflux after only 500mL. With patience, and time, I could get it to fill, but I had to hold the metal fuel flap at just the right point in order to hear the tank depressurizing (you could hear the air escaping). This angle was only a few degrees past closed. If the metal flap were fully closed or fully depressed, no air could be heard escaping. I phoned my local shop, but they weren't sure what the problem could be, and I'd like some idea before I take it in for repairs.

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