My wife has complained for sometime now about the gasoline smell in the garage, so I have been trying to find a cure and I think I have! Both of my cars have a 1/4" ID vent hose from the tank top exiting under the car. I found a Dorman #47149 vacuum check valve in the Help Section at my parts store. It's very small and fits the 1/4" line. It draws enough air while driving and doesn't restrict fuel flow. The Smell is Gone!