I have a 2006 tdi jetta that I bought used. Runs perfect but can't fill up normally. I have to really be gentle with the nozzle. Also the car has a dinky little neck , I can't use the big nozzles I always use on my duramax. Im unfamiliar with the mk5 tdi, but know the issue in the mk4. I've looked online, all the ventectomy are on mk4. So is there a vent somewhere and how do I change it ?