AvGas is a sealed can is still AvGas after 5 years.
Regular gasoline in a sealed can would be reasonable too, but I
wouldn't bet on gasahol.
There is also "TANK STETCHER" you can buy in a sealed can, that you
pour into your tank when you run out of gasoline to get you off the
highway and hopefully to a gas station. It has something like a 5 year
shelf life - but you need to use it while the engine is still warm -
you could have problems restarting a cold engine because it's vapour
pressure and volatility is quite low.
Just because you have E10 does not mean you WILL have problems - in a
very dry atmosphere you can often get away with it - and plastic tanks
are less likely to get condensation than metal tanks - ditto for full
vs half empty., and non-vented tanks (like on my chain-saw).
However, when ethanol fuel is combined with high humidity and extreme
temp changes, water DOES get absorbed by the ethanol, and itf that
moisture level gets high enough, and then the temperature drops, for
instance, you WILL get phase separation, where the alky and water drop
out of the fuel mix - and at higher power settingsparicularly on 2
stroke engines, the engine goes lean (and loses lubrication as well)
when that slug of watered down hooch hits theengine - and engine
That is ONE documented problem with hooch-gas.
The SECOND problem is when that watered down hooch sits in the carb
and corodes all the copper-containing parts. That's anything brass, as
well as a lot of alloy parts. Known as the "greenies", this corrosion
product plugs up jets and generally just fouls up everything it gets
The THIRD problem is the hooch is an oxidizer. That's why it is added
to the fuel - to make the fuel burn "cleaner" But over time, the
oxidizer oxidizes the fuel without burning it - forming a "varnish"
that also changes the calibration of the carb by half plugging the
jets, and makes float valves stick, damage diphragms in diaphragm
carbs and pulse pumps.
That's only THREE reasons Hooch-Gas is not good for (particularly)
There are others, but these are the main 3 - and NONE of them are "old
wives tales" or "Urban Legends", OR inconsequential.
On Apr 19, 8:04 pm, email@example.com wrote:
I agree. First, Popular Mechanics does a pretty good job vetting
legends from fact. Second, there have been plenty of other stories
done, with interviews of guys who own repair shops, that have
reported similar findings.
Does it mean that every small engine will have problems or behave
the same? No. Personally, I've had mixed results. My lawn mower,
leaf blower, edger, and chain saw have been fine. However, my
Tecumseh snowblower carb, for some reason, gets fouled up
within a couple months max. I've had it be fine at the start of the
when tested, then fail to start because of the carb a month and
a half later. And that is with gas stabilizer added. Yet that
same gas can be used in the other engines, left in them for 3X
as long, with no problems.
So, I'd say it depends. And I'd tend to believe repair shops,
who have far more experience with this than we do.
On Apr 19, 7:04 pm, firstname.lastname@example.org wrote:
Gee 25 years using ethanol and I have no complaints, I just dont keep
it more than 4-6 months in humid temps. Alcohol is a solvent that
reduces varnishing, I dont buy your oxidation theory- urban legand
crap. You are not going to get seperation if you use the gas instead
of letting it sit a few years, more urban legend crap. Water got
absorbed in regular gas to, or did you forget "water on the bottom of
the tank' it happens from condensation forming from changes in the
weather, google it. Alcohol does alow it to be burnt off instead of
sitting in the tank, a true benefit. So you posted 3 versions for
excuses of "its bad gas" vs " I was an idiot to keep it for several
years and why isnt it good anymore, it must be the alcohol. Bottom
line, use your gas in a few months, gas by itself goes stale, even
without alcohol, or the effects weather can have to increase moisture
content. And your alternative to ethanol, you dont have one unless you
waste your time.
You don't have to buy my theory, and 4 to 6 months CAN be too long
to keep fuel. Water is not "absorbed" in straight gas. Yes, you got
water in the tank, but it was separated from the gasoline. It DOES
cause problems, whether you have experienced it or believe it, or not.
As a mechanic I see it happen.
On 4/20/2011 5:06 PM, email@example.com wrote:
With all this yapping about alcohol in fuel, I had a thought, what the
heck are they doing in Brazil where many internal combustion engines are
run on straight alcohol? What problems have they overcome over the years
when their flex-fuel vehicles run E100 and E20 to E25 blends? o_O
On Fri, 22 Apr 2011 08:52:15 -0500, The Daring Dufas
They had their fun too, but their vehicles are ENGINEERED to use
ethanol as a fuel - and the high ethanol blends (basically just
heavily "denatured" ethanol) behaves much differently than, say E10 or
E15. With 80% ethanol, and particularly in a warm climate, phase
separation is not much of a problem.
Their injectors are stainless steel, all fuel system components are
designed to be highly corrosion resistant and ethanol resistant. They
use different "O" rings and seal materials, and different fuel lines
to withstand the chemical environment (teflon lined hoses come to
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