Mine did the same, with a smell of fuel in the car with a full tank- took me literally years to find the cause.
One rib of the concertina section of the filler pipe had sprung a pinhole leak, I think it was only when it got a bit bigger and petrol stained the dirt around the hole that I could find it.
I cleaned the whole area up and covered it with a covering of fuel safe epoxy resin, tightly squished in using my hands and then with zip ties, which also stopped it falling off due to gravity whilst it was curing. Been absolutely fine since.
The camera position for the photos is pointing up and to the back of the car, through a gap between suspension, exhaust etc. the car was up on a lift which helped a lot.
Cheers
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