Hi,
I'm had my filler neck off my 2.2l VX220 and wonder which direction the ventilation connection should face when re-fitting. Before I removed the filler neck, the ventilation connection was positioned around 10 o'clock when looking from the right hand side of the car. However, the diagram shown in the link below shows it positioned around 6 o'clock (item 2 on the diagram). My car has a wide body kit on it so the filler neck will have been off before I bought the car and hence may have been re-fitted incorrectly.
https://opel.7zap.co...0|---fuel tank/
assume the filler funnel should be fitted in the correct orientation to ensure the tank ventilation functions correctly when filling the car.