Gasoline degradation over time
The Chevron.com website has a on-line source that provides information for
your review. Specifically it says
22. How long can I store gasoline without it going bad?
Gasoline stored in a tightly closed container in a cool place will stay good
for at least one year. It is better if the container or fuel tank is almost
(95 percent) full. If the container or fuel tank will be in the direct sun
or will be heated above 30°C (80°F) much of the time, add an aftermarket
fuel stabilizer to the gasoline when you first buy it. Gasoline-oil blends
for two-stroke cycle engines stored under the proper conditions will keep as
well as gasoline itself.
On Tue, 28 Jul 2009 01:05:19 -0500, zxcvbob wrote:
There are 96 teaspoons to a cup measure. Two heaping teaspoons per pint
gives you roughly a 50/1 mix or one teaspoon per 8 oz. cup. Get a cup and
teaspoon kitchen measure and keep them in a plastic bag in the garage just
for this purpose. Two cups fill my weed eater or small chain saw.
96 to a cup measure? I went to milliliters to avoid such mixups. I mix
up in a small soda bottle because it's foolproof to get the oil fully
mixed, it's dandy to pour from, and I can save anything that won't fit
in the tank.
I tried it this weekend. 500ml water bottle full of StaBil'ized
gasoline, plus 10ml of Castrol 2-cycle oil measured with an old syringe.
It was just enough to fill the tank of my Echo weedcutter. (I didn't
know it had such a large tank.) I could probably mix the fuel directly
in the tank now that I know that, but it's a lot easier to pour from a
small bottle than from a 6 gallon gas can.
I don't know how long the syringe is gonna last. The oil may dissolve
or swell the rubber plunger and ruin it.
On the farm, where I did a lot of sawing and string trimming, I'd mix a
liter at a time. I used a piston syringe with a long tube, intended to
inject medicine down the throat of a lamb. As I recall, the o ring went
bad in a year or so.
The tube would reach to the bottom of an oil bottle. I used it with a
turkey baster, which lasted several years. Eventually the bulb cracked,
not from oil but from air. I replaced the baster.
With age, the tube shrank, which meant it took longer to draw the
required amount of oil, especially in cold weather. I should have
replaced the tube with clear 1/4" tubing just long enough to reach the
bottom of a bottle.
Now that I use a smaller soda bottle, I use a cheap plunger syringe.
Some cheap syringes may be impervious to oil. At a store the other day
I saw cheap bulb syringes intended to measure a dose of medicine.
You've got me thinking about using a soda bottle to transfer gas from an
approved can to my 4-cycle push mower. If I run out 200 yards from the
garage, that's half a mile of walking to fetch and return the gas can,
and I'm likely to spill some when I fill the tank.
Topping off before going out could reduce such occurrences, but topping
off from an approved can invites spilling. Besides, if I have to tip
the mower on the side, less gas in the tank means less chance of leaking
from the cap or through the carburetor. In storage, less gas in the
tank means less to lose by seepage, possibly into the crankcase. In
long-term storage, an empty tank and carburetor are probably better than
If I had to fetch a liter of gas for my mower, using a soda bottle could
mean no spilling, from the can to the bottle or from the bottle to the
mower. It could cut my walking in half because I could use a cord to
hang the empty bottle from the handle.
If I started out with a full soda bottle (or two) hanging from the
crossbar on the handle, I would never have to top off the tank because
I'd have a visible reserve. No more hassle if I have to tip the mower
on its side. If I didn't want the bottle hanging as I mowed, I untie it
at the work site. This could even make it practical to run the mower
dry before putting it away. Unused gas could be poured back into the
My paint thinner comes in a plastic gallon jug like antifreeze. For
that much gas, I'd rather use an approved container. A paint-thinner
can could get knocked over, and the cardboard cap seals I've seen aren't
reliable. I don't know how well that kind of plastic would stand up to
gasoline. I'd hate one day to mix gasoline with paint by mistake.
To transfer gas from an approved can to a lawn mower, the size and
opacity of a paint-thinner can could lead to spills.
If I used a soda bottle for a visible fuel reserve for a 4-cycle mower,
I'd remove the label and write all over the bottle with magic marker.
I'd pour the gas back into the approved can when I finished mowing.
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