[stephen wilson]

My '06 was "short-filling", I installed this fuel filler adapter that allows it to vent better, and all is well:
Fuel Delivery Unit Adapter Bracket 99720194400 - Genuine Porsche - 997-201-944-00 | Pelican Parts

https://rennlist.com/forums/997-forum/853540-going-to-fill-up-the-tank-and-clicks-too-soon-help-3.html