Is it only when you've JUST poured? If that's the case then it should be fine. It's only when your car smells like petrol all the time should you be worried.
I would suggest that your charcoal canister is not connected properly , or not connected at all.
This is located CLICK HERE (under the fuel filter in the engine bay) and controls emissions and also fuel vapour from entering the engine bay and cabin.
Check that it is there , and check that it is firmly connected
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