Quote Originally Posted by BuffaloJohn View Post
If the exhaust gas is from a reasonably tuned engine, then the exhaust gas would be comprised of water vapor, cabon dioxide, nitrogen oxide, and nitrogen. If it isn't complete combustion, you would have unburnt fuel and carbon monoxide in addition to those previous listed. If you run the exhaust for a minute or so, you would purge the oxygen from the tank and the warm exhaust would carry most of the fuel vapors that might be left in the tank.
Yes, my warning was just the now almost obligatory warning against anything with even a slight risk attached. It is no longer fashionable to let Darwin have his way.