[Stichwerks]

You might also want to change the stock roof vent to either and Xtreme vent or the Cyclone vent. It moves with the wind direction and does an outstanding job of pulling fumes out of the tank. Since I installed one I have had no fumes. It works with the slightest of breezes and is a very cheap investment. Cost is around $22 for the Cyclone and $49.