Ethanethiol (stinky stuff) is a flammable liquid that evaporates at 68* F and is heaver than air. LP is also heaver than air. When I was ready to start my tank I rolled it up side down placing it on riser. I then inserted a air hose from a compressor into the drop tube of the tank. LP tanks have a tube under one of the plugs that goes to the bottom for removing the liquid gas. Because the tank is now up side down and all plugs removed the air is pushing heaver fumes out the openings of the tank. I did this in a VERY well ventilated area. the fumes are not good to breath. I do not recommend anyone try this. Its what I did and lived to tell about it. You might not.