Originally Posted by bentwings
I use a standard gas line filter on my vent line. No problems at all.
Originally I had intended to use a charcoal system out of an early 80's GM but this worked very well instead.
I have used this same thing, have one on my DD Malibu wagon as we speak. Just tuck it out of the way, pointing down so no water, etc. can get into it. But my car is outside so I don't know how well this would stop the smell of gas inside a garage.
As for a charcoal canister, I'd imagine an OE vapor canister would work just fine. It wouldn't be plumbed for vacuum to pull vapors into it, but as l9ng as the vent line that is causing the fumes in the garage is connected to the canister, the fumes will have to pass through the activated charcoal.
I'd source one from a 'yard, from a small car/engine so it would be compact. Refresh the charcoal if needed, run the vent line into it and you're done.