John_Mc
Elite Member
- Joined
- Aug 11, 2001
- Messages
- 4,595
- Location
- Monkton, Vermont
- Tractor
- NH TC33D Modified with belly pan, limb risers & FOPS. Honda Pioneer 520 & antique Coot UTV
Expelling fuel to be replaced with o2 never made any sense to me. A thin film of fuel will varnish far faster on surfaces than a full bowl with less oxygen. Not too unlike paint in a can.
I always mix my fuel from non-ethanol gas, and add a fuel stabilizer. (I only have to go about a mile out of my way to get non-ethanol, so it's not an inconvenience to use it, and it's a fact that it has significantly longer shelf life than E10 gas.) If the saw is going to be used in the next couple of days, it gets put away with whatever fuel is in the tank when I shut it down. If it's going to be a bit longer than that, I fill the tank.
For long term storage, I run the tank dry. Yes, that thin film of fuel will evaporate more quickly, but the very minimal residue left behind in the tank or carb has never yet been a problem. The residue from allowing a full carbs' worth of fuel to evaporate can be more of a problem. I absolutely will not store a saw long term with E10 gas in it. The ethanol will actually pull moisture out of the air and combine with it. When enough of this has happened, Phase Separation occurs: the ethanol/water mix settles out of the fuel. This is a corrosive mixture, and can ruin the carb and bottom end of your saw if you let it sit for too long. I have actually seen the results of this on two saws sitting partially disassembled at a local repair shop. The shop owner actually kept one of them around to show people why he recommended that "if you use E10 gas, use it up quickly, and don't leave it sitting in your saw. If you are not turning it over quickly, or may forget to drain your saw and run it dry before extended storage, use non-ethanol gas."
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