Because I was fed up with the slow fuel filling (especially the last liters) I made a hole in the filler neck to let the air out and to speed up the filling.

Remove the screws on top and one on the inside of the cap (don't drop them )


Checked if the was room between the neck and the tank: yes there is.


Drill a hole (6 mm), don't go to far!!


Finished


Tank is full so I don't know if it works, to be continued......