but with me it is unfortunately exactly the other way around ! There is an overpressure in the tank, which then over the tank cover etc. ventilated. As a result, you can no longer ride with an open sunroof, otherwise the extreme petrol smell gets into the vehicle via the trunk. ( When driving with an open sliding roof in the passenger compartment, a natural underpressure is created by the pull of the wind ) I then tested the vent at the thank-you exit and found that there was a slight backpressure in both directions when blowing through. Now My Questions : 1. Someone has an ID and knows if that's normal and two. I could not see from the rep. manual how exactly the ventilation via the activated carbon tank is controlled by the electromagnetic vacuum valve. Where does el. Signal and when is there ?? Can anyone help me?? Still something amazing - if I install the ventiel on the tank opposite as predetermined then the overpressure is gone. But the valve is clearly marked with tank side and engine side. Just turn can not be the final solution !! I hope for your good advice and experiences !! Thanks and Tschau UweIs it not a question of the archgebirsche !