1.4 FSI tank ventilation

Hello together, am lupo newling and have since short nen FSI which does not really want to take GAs. After I filled up, it ran minimally better. Since much my suspicion of the tank ventilation. I changed the activated carbon filter and the vent valve. Holds the hand to the valve, you can relatively rarely feel the clock frequency. and for a short test drive the thing finally went off well, but at the next ride again dead pants, no clock at the valve, no acceleration. HOT WHO N tip for troubleshooting without a diagnostic device? the valve has between the two pins n resistance of 25 ohm. (should probably lie between 20 and 28) When ignition is off, both pins tensionless and no pin has connection to mass. ignite one, pin one has battery voltage 12,6V and pin 2 must be around 4V against mass. motor, pin one is between 13,1 and 13.8V can not be exchanged with the digital pin?