Touareg: 2004 V8
Join Date: Apr 2012
Location: Chicago NW Burbs (IL)
Second Vehicle: too many to list
Thanked 4 Times in 4 Posts
No check engine (MIL) light?
Guessing the previous owner had a habit of topping up (Adding more fuel after the nozzle cuts off).
You can try driving it a while and see if it gets better or worse.
I would avoid filling it all the way to the top and see if whatever is clogged open up.
An illegal fix would be cutting a vent line, and installing a "T" and adding a small vent on the "T".
Probably a small engine fuel filter capped off with a few pinholes in the cap would work.
It might trip a MIL showing an vacuum leak, so be ready to undo it.
Or get a new charcoal canister and hope that is it before chasing down a bad vent/purge valve.
I had an old Triumph (GT6) do this and the vacuum created pulled in the sides of the fuel tank. I first noticed it when I had fuel supply problems when racing.