I've had a hard time locating a fuel smell that I have when driving.
I replaced and restored almost the whole fuel system but the smell was still there.
Finally I checked an Expansion tank located just under the dashboard.
There was two cracks that allowed fuel vapor to escape.
I had to remove the Air vent Control box to get it out, so now I'm also cleaning up that whole area.
Porsche 911 2.4T US version (CIS)