Yes it could be the source of your air leak reported fault I think.
I was part of a recent FSI discussion that included this charcoal filter but a large part must be the same for your 1.4 both being petrol. In a nutshell from what I remember the charcoal filter sits on a vent line from the petrol tank, a solenoid valve (you spotted) opens and and allows unwanted vapour to discharge into the inlet manifold. So a leak in the line will appear as a leak from the inlet manifold. For some weird reason I think I also remember the charcoal filter on your 1.4 is located behind the front O/S wheel arch liner???
Hope this is of some help.
Andy
I was part of a recent FSI discussion that included this charcoal filter but a large part must be the same for your 1.4 both being petrol. In a nutshell from what I remember the charcoal filter sits on a vent line from the petrol tank, a solenoid valve (you spotted) opens and and allows unwanted vapour to discharge into the inlet manifold. So a leak in the line will appear as a leak from the inlet manifold. For some weird reason I think I also remember the charcoal filter on your 1.4 is located behind the front O/S wheel arch liner???
FSI hesitation under light acceleration
If anyone has an FSI with a slight hesitation when accelerating from lower RPM I may have found the problem by accident. I purchased my FSI about 5 years ago and as normal I have had a lot of frustration with it culminating in have a replacement engine at WOM,but even after that I still had this...
www.a2oc.net
Hope this is of some help.
Andy