Cleaning the bilge will help reduce the oder. Also... before putting it away, leave the hatches open for a few hours. Then when you put it away, most of the left over fuel smell will be gone.
If it's as bad as you are saying... I would add a vent fan to the garage, and seal the door between the garage and the house better.
Oh... one last thing... if you get a good fitting cover (like one from Poppy) that will contain the stink. I know when I open the cover on my boat when it's sleeping for the winter... the fuel smell is overwhelming, but the cover contains it.