My brother has an Airens model 921030 2-stage snow thrower. It's about 5 years old. This machine has had issues with starting in the past, and a couple days ago when we had a light snowfall, he was unable to start it. I checked it out, but could not get it running. Here is what I know:
The spark plug was wet - so I am assuming the engine was flooded from the multiple starting attempts
There is a spark. I pulled the plug out, and was able to observe a spark when the engine was cranked using the electric starter
The spark plug looks OK. There doesn't appear to be any carbon buildup, and I didn't see any cracks. The plug was replaced 1 or 2 years ago.
The gas in the tank is very old. Probably 4-1/2 years old. I had added Stabil to the gas, and applied a tag to the can. That tag reads 7/15, indicating I added the Stabil in July 2015.
I am fairly certain that the machine started and ran OK in early November. Could already stale gas go completely bad in only 2-1/2 months?
I left the spark plug out in hopes the engine would dry out in a week or so, then plan to return and replace the gas with a fresh tank.
One thing I am unsure about is whether I will be able to get my siphon into the tank, as it has a plastic guard which will prevent my hose from being dropped into the tank. The siphon is the one that has the metal valve at the end:
How difficult is it to remove the plastic guard?
I appreciate any suggestions.