Originally Posted by
spaceworm
I run Coleman's camp fuel (naptha) mixed with Klotz oil in my ECDI Zenoah G23, and it runs and smells great (I can't stand the smell of ethanol laced gasoline). It only is about 50 octane, so some may say that is too low for their high performance DA and DL et al gassers. Since Coleman's does not go bad (think white gasoline used in outboard engines) and does not have ethanol in it, it does not attack the carb diaphragms or any other parts of our engines, I just leave it in the tank for storage. Works well for me.
Some DE/DA engine owners use the Coleman's fuel (with oil per spec) for the last run of the day or season. Not to fly, but just to purge the engine and fuel system of regular gasoline. Then they just leave the system filled with it. Another option for running and storage is AVGAS. Since AVGAS is expected to stay in the AC's tanks for long periods of time, and does not have ethanol. it is also stable and can be left in our engines and tanks during storage. Like naptha, AVGAS also smells good.
"Your results may vary"
I also use Coleman camp fuel along with some extra oil in my engines for short term storage. Up to around 6 months. It doesn't seem to allow the diaphragms in the carb to deteriorate. However, I would never actually fly with it due to the very low octane plus the fact that it makes an engine run hotter.
I remove the flight fuel, add about half a tank of the "storage" fuel, start and run the engine at varying throttle settings, then run it at full throttle and choke it to kill it. I then leave the half tank of storage fuel in the tank, and cap off the fuel tank vent line. Doing this has kept my diaphragms and fuel lines nice and supple indefinitely.
(Just my "two cents worth.....)
AV8TOR