Removing Ethanol from Gasoline

   / Removing Ethanol from Gasoline #1  

dave1949

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Ran across this magazine article in Northern Woodlands. Sorry it's not online yet. Maybe it's old news, but it was new to me.

A small engine repair mechanic, Dwight Broome in Concord, VT cut the bottom off a propane tank (large enough to hold 5+ gal) and unscrews the valve fitting replacing that with a pipe that will be a drain. Then he turns it upside down so the drain pipe is at the bottom. He built a stand to hold it upright.

He pours 5 gallons of E10 gas in, then two quarts of water. The water combines with the ethanol and turns milky white. The water+ethanol sinks to the bottom where he drains it from the tank using the pipe. What's left in the tank is ethanol free gas which he drains back into his 5 gal. jug.

He uses the water+ethanol as windshield washer fluid (good down to -40F he says, although I doubt it's been -40F in Concord, VT ?), or to fill small lawn/garden tractor tires.

So, if you can't find ethanol-free gas, you can separate it. Dwight says he got tired of repairing the stuff ethanol eats in chainsaw and other small engine carbs, especially older equipment not made to withstand the corrosive ethanol.

He uses an ethanol content tester like this one:
Tiny Tester - Alcohol/Ethanol Content Tester | Accessories | Fuel, Lubricants & Mixes | www.baileysonline.com

and says it's not uncommon to find E10 with more than 10% ethanol--which would exceed some small engine specs. We've had a lot differences noted from posters who have or have not had ethanol problems, maybe the variation in supplier's batches accounts for some of that.

As usual he recommends draining the fuel tank and running the carb dry when not using small engines.
 
   / Removing Ethanol from Gasoline #2  
Problem is you end up with a pretty low octane gasoline because the refiners take advantage of the high octane of the ethanol when blending the e10.

Maybe with ultra premium there'd be an acceptable amount of octane left
 
   / Removing Ethanol from Gasoline #3  
That is why ethanol should not be used when mixing a premix 2 cycle fuel. As the fuel sits, it may collect moisture which will be absorbed by the ethanol. The oil will then be separated into the pure gas as oil and water don't mix. Now your fuel will be separated into 2 parts: pure fuel with a heavy mix of oil and the ethanol water mix. Yes, it takes a bunch of water to do this but my neighbor can do it!

I have been using a ethanol tester like that since the early 80's.
 
   / Removing Ethanol from Gasoline
  • Thread Starter
#5  
   / Removing Ethanol from Gasoline
  • Thread Starter
#6  
That is why ethanol should not be used when mixing a premix 2 cycle fuel. As the fuel sits, it may collect moisture which will be absorbed by the ethanol. The oil will then be separated into the pure gas as oil and water don't mix. Now your fuel will be separated into 2 parts: pure fuel with a heavy mix of oil and the ethanol water mix. Yes, it takes a bunch of water to do this but my neighbor can do it!

I have been using a ethanol tester like that since the early 80's.

Do you see much variation in the ethanol percentage when you check it?

I've never had much reason to work around ethanol issues but I know people do. I treat premium gas with Sta-Bil and run 2 and 4 cycle engines dry if I'm not using them and have been lucky so far.

I don't have older, pre-ethanol equipment so I'm sure that makes a difference too. My last two chainsaw failures were death by operator error and a bad bar oil pump.
 
   / Removing Ethanol from Gasoline #7  
This year, I bought 5 gallons of "boat gas", which is ethanol free, to run everything but my mower on.

It lasted me all season.

The Boat gas is too far away, to be convenient for me to use it in the mower. And, the E10 seems to be working fine in there.

In the meantime, if everyone keeps asking for boat gas, at their local stations, more may start selling it.

I have stations 2 now, But, both are 40 minutes away.
 
   / Removing Ethanol from Gasoline #8  
Do you see much variation in the ethanol percentage when you check it?

I've never had much reason to work around ethanol issues but I know people do. I treat premium gas with Sta-Bil and run 2 and 4 cycle engines dry if I'm not using them and have been lucky so far.

I don't have older, pre-ethanol equipment so I'm sure that makes a difference too. My last two chainsaw failures were death by operator error and a bad bar oil pump.
I don't check for ethanol much now as I don't work in a shop anymore. We have plenty of pure gas around here so I don't have any issues with my fuel.
 
   / Removing Ethanol from Gasoline #9  
Problem is you end up with a pretty low octane gasoline because the refiners take advantage
of the high octane of the ethanol when blending the e10.

Maybe with ultra premium there'd be an acceptable amount of octane left

I was concerned about that, too. So I converted one gallon of Premium. It was not hard to do, but I have
not done it again since I used up that one gallon of pre-mix. I do not know how much the octane
number of the low-ethanol gas went down.

I recommend to all the infrequent 2-stroke users I know: buy the $8 quarts that DAVE1949 refers to.
 
   / Removing Ethanol from Gasoline #10  
Adding oil to gasoline (premix) also lowers octane. That is why they say to start with premium.
 

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