Every time I fill up and garage my car, there is a smell of gas in the air.
There are no leaks, I checked carefully. After a bit of driving, and reparking, all is well. In other words, smell is only present when the tank is full.

A good possibility is the tank vent hose, which goes from the tank to the top of the filler pipe. Most of the hose can be seen if you take off the right side interior panel in the trunk.

The next time you fill up, drive it home and reach up behind the wheel and on top of the tank and see if you can get some gasoline on your fingers at the bottom of the vent hose.

Otherwise, check the seal around the pump.

Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.

Try changing the fuel filter.
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Jake