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Old 03-06-2013, 08:03 AM   #1
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"old gas"


What does "old gas" mean?

Bought a lawnmower last summer. It still had gas in it when I stopped using it for the winter. Also my little gas can has some gas left in it.

The mower directions said not to use "old gas". What does that mean? How old is old?

If I can't use it how could I dispose of it and what about the gas left in the mower?

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Old 03-06-2013, 08:20 AM   #2
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Any gas over 6 or so months old degrades and has less octane unless someone added some Stabil to the fuel.
http://www.goldeagle.com/brands/stabil/

Just dump what's left of the old gas in your car.

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Old 03-11-2013, 08:29 AM   #3
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The gas that sat in the lawn mower has evaporated partially and some components don't evaporate as fast. The latter may become gummy. The small amount of stale gas added to a larger amount of fresher gas in a car gas tank will usually not cause any problems.

The small amount of stale gas that remained in the lawn mower gas tank, after you siphoned most out and after being mixed with fresh gas, will probably not cause a problem except that if gumming up occurred in the passageways going into the lawn mower engine, the lawn mower may need servicing. Too late now; all you can do is remove as much old gas as you can, add at least a half tankful (relative to the lawn mower) of gas, and hope the lawn mower starts.
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Last edited by AllanJ; 03-11-2013 at 02:42 PM.
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Old 03-11-2013, 09:22 AM   #4
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Why anyone would put gas in a $30,000 piece of equipment that wasn't suitable for a $50.00 lawn mower beyond comprehension. It rates right up there with the most bone head action of the year award.
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Old 03-11-2013, 09:25 AM   #5
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Quote:
Originally Posted by Fairview View Post
Why anyone would put gas in a $30,000 piece of equipment that wasn't suitable for a $50.00 lawn mower beyond comprehension. It rates right up there with the most bone head action of the year award.
Because half a gallon of "bad" gas diluted into 10 gallons of good gas is going to create 10.5 gallons of good gas. Also, your 30,000 dollar piece of equipment is better equipped to handle things that are a little off than a POS lawnmower. ALSO also you use your car every day so it's not going to sit and gum things up. Need me to keep going?
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Old 03-11-2013, 10:17 AM   #6
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Quote:
Originally Posted by TheBobmanNH View Post
Quote:
Why anyone would put gas in a $30,000 piece of equipment that wasn't suitable for a $50.00 lawn mower beyond comprehension. It rates right up there with the most bone head action of the year award.
Because half a gallon of "bad" gas diluted into 10 gallons of good gas is going to create 10.5 gallons of good gas. Also, your 30,000 dollar piece of equipment is better equipped to handle things that are a little off than a POS lawnmower. ALSO also you use your car every day so it's not going to sit and gum things up. Need me to keep going?

Ayuh,.... I disagree,...
Addin' 1/2 gallon of Rotten gas to 10 gallons of fresh gas gives ya 10, 1/2 gallons of Bad gas....

Gas can be sorta Tested by Smellin' it....
If it still Smells like gas, it's still gasoline....

If gas Stinks, 'n don't smell like fresh gas, it's Rotten, 'n oughta be thrown Away....

The cars of today will not digest Bad gas nicely, it's clog some rather Expensive things...
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Old 03-11-2013, 10:25 AM   #7
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Seafoam= Stabil = Thumbs Down
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Old 03-11-2013, 11:41 AM   #8
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Quote:
Originally Posted by Bondo View Post
Ayuh,.... I disagree,...
Addin' 1/2 gallon of Rotten gas to 10 gallons of fresh gas gives ya 10, 1/2 gallons of Bad gas....

Gas can be sorta Tested by Smellin' it....
If it still Smells like gas, it's still gasoline....

If gas Stinks, 'n don't smell like fresh gas, it's Rotten, 'n oughta be thrown Away....

The cars of today will not digest Bad gas nicely, it's clog some rather Expensive things...
I'm sorry but from a pure science standpoint this makes little to no sense. For the most part when gas gets old it a) loses octane and b) gathers water. Both of which are bad in high enough concentration for sure, but unless it's SUPER old (like, a year+, not a few months), neither of those things are going to be a huge issue. A 20:1 ratio of good gas will make a tiny percentage of lower octane gas and / or water all but disappear.

You're not pouring maple syrup into your car. You're pouring gasoline that has lost some of its potency.
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Old 03-11-2013, 07:43 PM   #9
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IMO, from doing scientific testing at my house with outdoor power equipment: I have found that today's "Ethanol" gases left in a fuel tank for only thirty (30) days will separate leaving a gummy substance in the bottom of the tank. Consequently this gas will do the same thing in a float bowl of a carb and nothing other than elbow grease will remove this gummy stuff. From the school of hard knocks I have learned that when I am finished using anything with a gas engine I try to run out the remaining gas or at least add "Sta-Bil" or "Seafoam" to the remaining gas then try to use it up soon.
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Old 03-11-2013, 10:47 PM   #10
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thurman,

you know, I just figured that I should have run the mower till it was out of gas. Too late now tho.

Where do you buy Seafoam or Sta-Bil ? Maybe HD has it?

Jagans made a reference to both yesterday but I didn't know what he was talking about.

This mower is like my car. It was nicer when I had a dad or hubby around because I just turned a key and things ran. I never knew all the work keeping things that way.
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Old 03-11-2013, 10:50 PM   #11
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Any place that sell auto parts, Wal-Mart in the auto dept. will have it.
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Old 03-11-2013, 11:30 PM   #12
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If you can find it locally, you should use ethanol free gasoline but it is hard to find anymore.
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Old 03-11-2013, 11:38 PM   #13
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That's I ever use in my power equipment.
I live in a big boating area so I can buy it in at least 5 places within a few miles of my house.
One gas station even has 2 pumps for it.
Since I added filters and only run non ethenol in my equipment everything starts and stays running everytime.
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Old 03-12-2013, 08:59 AM   #14
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I have put older gas in the tank of my older pickup and have had no problems, but I also put in a can of Chem tool B-12 and a little sea-foam now and again, so maybe I am putting in water then absorbing it with methane, who knows. The best thing to do is add Sea-Foam to your gas in the gas can, not the gas tank. The thing that gets my goat is that I used to buy Sea-Foam at wally world for around $4.50 a can before everbody found out about it. Now the same can is like $8.50 Supply and Demand I guess.
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Old 03-12-2013, 09:35 AM   #15
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You also have to check the label on Sta-bil there are 2 kinds now, one for gas with ethanol, I have been told the older kind does not work with ethanol. Probably not a good idea, but if there is a private airport nearby you may be able to buy 80 or 100 octane no lead gas.

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