It's a common misconception that gasoline will evaporate out of wood, but the truth is, it won't. If you've ever spilled gas on your deck or patio and are worried about the fumes seeping into your home, don't be. The gas will eventually evaporate, but it will take much longer than you think - up to six months or even longer. In the meantime, you can help speed up the process by airing out the area and using fans to circulate the air.