Garage smells like fuel

FYI, just had that same issue on my sons Duster, my wife was so pissed I thought the car was going to spend the winter in the driveway, he drained the fuel pulled the tank, and found the filler grommet was cracked and leaking a bit but enough to make the smell, you guys have a bigger ethanol in the fuel issue down there than in Canada as our percentages are MUCH lower, some stations are worse than others but our Chevron up here is very low, also there is a product called" Startron" it is a fuel additive designed to combat methanol issues as well as other fuel issues, and it is also a fuel stabilizer, we use it regularly in the Marine business it is very cheap as a 1/2 liter bottle treats about 1200 liters, it would help with your issue.