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I had a similar issue, the cabin and front trunk always had a petrol smell. I replaced all the vapour lines between the fuel tank, expansion tank (in the front left wheel well) and carbon canister in the rear. This seemed to pretty much fix the issue for me, was impossible to know where the problem was exactly. This includes the line that connected in from the expansion tank to the hard line down the centre tunnel just forward of the gear stick.
I did also notice another issue that may have been a contributing factor. There is a T connector in the front trunk that goes from the fuel tank to the expansion tank and then vents at the fuel filler. I found that if I overfilled my fuel tank my expansion tank would fill with petrol via this connector. I fixed this by moving the T connector as far up the line towards the fuel filler as it would go.
Not sure that opening the carbon canister would be fruitful, I would say so long as it looks ok and feels full then its ok.
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