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#2077039 - 11/14/10 10:53 PM How does Sta-bil work ?
j_mac Offline


Registered: 12/30/08
Posts: 398
Loc: wv
I've heard mention that Sta-bil floats on top of the fuel in the gas tank and carburetor float bowl.
This would presumably form a barrier between the fuel and the atmosphere where moisture absorbtion and fuel evaporation would otherwise take place.
IS THIS CORRECT?

Any and all input would be much appreciated.

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#2077056 - 11/14/10 11:10 PM Re: How does Sta-bil work ? [Re: j_mac]
Quest Offline


Registered: 12/19/04
Posts: 6082
Loc: beaver land EH?
Nope.. this is absolutely poppycock!

gas stabilisers work by stabilising otherwise unstable aromatic hydrocarbons, the one that would go bad fairly quickly.

That being said, however, even with stabiliser additives in gas, it can only last so long (maybe a year or so, depending on storage conditions, etc.) before it eventually goes sour.

Bottomline: fuel stabiliser basically slows down the process, not necessarily stopping it from decomposition entirely.

Q.
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#2077070 - 11/14/10 11:30 PM Re: How does Sta-bil work ? [Re: Quest]
sunfire Offline


Registered: 04/08/08
Posts: 1571
Loc: Ca, US
Can someone explain how Sta-bil does this?

Originally Posted By: Sta-bil
Removes water to prevent corrosion...


And what about water at the bottom of the tank?


Edited by sunfire (11/14/10 11:33 PM)
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#2077111 - 11/15/10 12:39 AM Re: How does Sta-bil work ? [Re: j_mac]
FowVay Offline


Registered: 06/02/02
Posts: 2097
Loc: Southeastern USA
Products like Sta-Bil are known as oxidation inhibitors. Their objective is to slow the degradation of the fuel molecule by keeping the fuel and oxygen from reacting. This type of protective stabiliser will generally last for up to two years depending on the environment the fuel is stored. Humid areas don't last nearly as long as arid environments due to moisture.

So think of the stabiliser as putting a protective barrier around the fuel molecule to keep it away from the air. Fuels stored in sealed metal containers will outlast fuels stored in naturally aspirated containers for the exact same reason.
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#2077173 - 11/15/10 06:10 AM Re: How does Sta-bil work ? [Re: j_mac]
Boomer Offline


Registered: 09/19/08
Posts: 1585
Loc: Pennsylvania
Stuff like Stabil generally contains hindered phenolics that act as sacrificial molecules. That is, they react with oxygen before unsaturated materials in the gasoline can. BHT in food is an example of a hindered phenol. When all of this material is used up by reaction with oxygen, then the gasoline is vulnerable. Typically, additives use 2,5-dimethylhydroxy benzene as the antioxidant for fuels.
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#2078110 - 11/15/10 09:46 PM Re: How does Sta-bil work ? [Re: j_mac]
paulo57509 Offline


Registered: 07/13/03
Posts: 1683
Loc: Tracy, CA
In my experience (my old '93 Yamaha FZR600) Sta-Bil will last at least two years. The machine ran fine with this two-year old treated fuel, but it got horrible fuel mileage. The +4.5 gallons lasted only 84 miles before hitting reserve.

I have no idea how it works, but it does.

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#2079309 - 11/17/10 12:24 AM Re: How does Sta-bil work ? [Re: paulo57509]
j_mac Offline


Registered: 12/30/08
Posts: 398
Loc: wv
thanks for the info and setting this issue straight guys...

So the Sta-bil actually completely mixes in with the fuel completely...

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#2081089 - 11/19/10 12:06 AM Re: How does Sta-bil work ? [Re: j_mac]
dwendt44 Offline


Registered: 05/17/06
Posts: 3571
Loc: Central Wisconsin
If Stabil is added to the container first, then filled with gas to agitate and mix the stabil through out the gas.

Just adding it to a tank of gas doesn't do much at all.
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#2086193 - 11/24/10 04:50 PM Re: How does Sta-bil work ? [Re: dwendt44]
daman Offline


Registered: 09/23/06
Posts: 10419
Loc: Bad Axe, MI
Originally Posted By: dwendt44
Just adding it to a tank of gas doesn't do much at all.

It does if you add the stabil first then fill your tank.
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#2086303 - 11/24/10 07:04 PM Re: How does Sta-bil work ? [Re: daman]
flatlandtacoma Offline


Registered: 07/08/06
Posts: 1022
Loc: Illinois
Originally Posted By: daman
Originally Posted By: dwendt44
Just adding it to a tank of gas doesn't do much at all.

It does if you add the stabil first then fill your tank.

confused Isn't that what he said?
Originally Posted By: dwendt44
If Stabil is added to the container first, then filled with gas to agitate and mix the stabil through out the gas.
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#2086309 - 11/24/10 07:08 PM Re: How does Sta-bil work ? [Re: flatlandtacoma]
daman Offline


Registered: 09/23/06
Posts: 10419
Loc: Bad Axe, MI
Originally Posted By: flatlandtacoma
Originally Posted By: daman
Originally Posted By: dwendt44
Just adding it to a tank of gas doesn't do much at all.

It does if you add the stabil first then fill your tank.

confused Isn't that what he said?
Originally Posted By: dwendt44
If Stabil is added to the container first, then filled with gas to agitate and mix the stabil through out the gas.

Originally Posted By: dwendt44
If Stabil is added to the container first, then filled with gas to agitate and mix the stabil through out the gas.

Just adding it to a tank of gas doesn't do much at all.


i dont know did he?? he's talking about the container not the tank in your car.
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#2087285 - 11/25/10 08:59 PM Re: How does Sta-bil work ? [Re: daman]
flatlandtacoma Offline


Registered: 07/08/06
Posts: 1022
Loc: Illinois
Originally Posted By: daman
Originally Posted By: flatlandtacoma
Originally Posted By: daman
Originally Posted By: dwendt44
Just adding it to a tank of gas doesn't do much at all.

It does if you add the stabil first then fill your tank.

confused Isn't that what he said?
Originally Posted By: dwendt44
If Stabil is added to the container first, then filled with gas to agitate and mix the stabil through out the gas.

Originally Posted By: dwendt44
If Stabil is added to the container first, then filled with gas to agitate and mix the stabil through out the gas.

Just adding it to a tank of gas doesn't do much at all.


i dont know did he?? he's talking about the container not the tank in your car.

If you don't know, perhaps you should look at a dictionary :
tank [tangk] –noun 1. a large receptacle, container, or structure for holding a liquid or gas
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#2087687 - 11/26/10 12:11 PM Re: How does Sta-bil work ? [Re: j_mac]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 13664
Loc: Sunny Florida
Stabil is not some kind of oil that is resistant to mixing.

Pour it into fuel in a clear container. It mixes thoroughly and completely with no agitation.
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#2088783 - 11/27/10 06:59 PM Re: How does Sta-bil work ? [Re: flatlandtacoma]
daman Offline


Registered: 09/23/06
Posts: 10419
Loc: Bad Axe, MI
Originally Posted By: flatlandtacoma
[If you don't know, perhaps you should look at a dictionary :
tank [tangk] –noun 1. a large receptacle, container, or structure for holding a liquid or gas


Dude your kidding me right? thats some funny [censored] right there^^
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#2095460 - 12/04/10 03:35 PM Re: How does Sta-bil work ? [Re: j_mac]
javacontour Offline


Registered: 06/26/03
Posts: 7231
Loc: Illinois
One thing to consider is don't add it to an empty tank of your equipment and then add the gas.

Recently, I drained the gas in my generator and poured that gas into the kids car. (They are always looking for "free" gas!) I put enough Stabil in the tank for 5 gallons of gas, added the gas and the generator wouldn't start.

Seems I filled the carb with stabil. I closed the fuel shutoff, drained the carb, putting the contents back into the tank with a little more stable for good measure, and it would run again.

So I would caution that anything gravity fed should be pre-mixed prior to the adding to an empty tank. Adding the stabil first lead to a no-start condition as is went right to the carb.

I know, I could have closed the valve as well. However, it still would have filled the line and not mixed as well.

Add it to a gas can or a full tank of fuel. But don't add it to an empty gravity fed tank.
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