In all seriousness, the only way I know of is to run your vent line through a charcol canister, but have no personal experience with that.
I've been around lots of race cars and street rods stored in enclosed trailers and garages and I've never even noticed a gas smell. Maybe I just expect it and my brain ignores it.
You guys do realise that you own hot rods, right? They're supposed to be stinky and loud.
