When I am stopped at the lights with my Caddy Life TDI, I will put the ventilation system on recirculate because it will get a bit of diesel exhaust smell in the cabin. I believe this is because the exhaust pipe ends underneath the rear bumper so the exhaust gets caught underneath the body of the vehicle when it is stationary and get dragged into the intake for the ventilation system. It could be the same issue for your TSI but if it definitely fuel odour as opposed to exhaust odour then it might be worthwhile getting that checked because you might have a problem somewhere in the fuel/exhaust system.
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