I just syphoed out about 5 gallons of old gas and to get read of it I put it out side in 2 big open pans and about 2 or 3 weeks later it was all evaporated away totally ,,,,,,,,, on the rainy days I put a sheet of plywood over it seemed to work good for me but I was real nervous that somebody might flick a cigerette and start a inferno real glad its all gone its hard to get rid of old gas cause nobody in my area will take it.......