Leaking gas from carburator drain plug. Replaced screw…….still leaking. Any help in how to fix the leak? I bought this quad used. I found a skematic of the carburator that shows a drain tube. My kodiak does not have this tube. Should I have the tube and if so where does the tube go once it leaves the carburator? Does it attach to something else of just drain to the ground? Any and all help appreciated.