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post #1 of 9 Old 04-27-2013 Thread Starter
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Gasoline Additives?

Does anyone use additives in gasoline to prevent phase separation? What's your favorite?
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post #2 of 9 Old 04-27-2013
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Re: Gasoline Additives?

Trick question. Based on 3rd party test, none prevent phase separation. Options that work?

* Run engine more. Some people try to run little and wonder why the gas doesn't last a year. Gasoline is just not that stable and needs to be changed, like oil.
* Keep tank full to minimize breathing.
* Close the vent while not running dingy outboards.
* Install a vent drier.

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Re: Gasoline Additives?

Pay a little extra and buy non ethanal gas. It works for me.
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post #4 of 9 Old 04-27-2013
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Gasoline Additives?

Algee, i didnt know you can buy non ethanol gas, that wiuld solve alot of problems
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Re: Gasoline Additives?

In some states you can still buy pure gasoline, in others you cannot.
Ethanol-free gas stations in the U.S. and Canada to check it out.

Gasoline is a witches brew of about 60 ingredients including some that boil off and evaporate at room temperature, but Stabilant will help keep it from breaking down for 1-2 years. The folks at Stabilant also have a brew that's supposed to keep gasahol from breaking up, and they've got an outstanding reputation so I'd expect it also works.

Straight "pump gas", with or without alcohol, is intended to be used in 60-90 days. I think it was in the 90's that the EPA also changed rules, and gas doesn't break down and form varnish as badly as it used to before then.
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Re: Gasoline Additives?

Sea foam works for me.
Jim

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Re: Gasoline Additives?

Seafoam is a mixture of isopropanol, light machine oil to relubricate the cylinder walls after the isoprop has stripped them, and naphtha, which is gasoline stock.

So if Seafoam does anything for you, putting in cheap straight isopropanol, which also "binds" water, will do the same thing. There's no magic in Seafoam, you've got all the ingredients at the local hardware store way cheaper.
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Re: Gasoline Additives?

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Originally Posted by Quickstep192 View Post
Does anyone use additives in gasoline to prevent phase separation? What's your favorite?
There is only one that is really effective, and that is Butyl Cellosolve.
I buy a gallon on line and it lasts me about 4 years for a 3 and an 8 hp outboards, as well as lawn maintenance equipment. Ignore the lamentations of liberal tree huggers, and You'll be just fine.

Dick
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post #9 of 9 Old 04-27-2013
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Re: Gasoline Additives?

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Originally Posted by hellosailor View Post
Seafoam is a mixture of isopropanol, light machine oil to relubricate the cylinder walls after the isoprop has stripped them, and naphtha, which is gasoline stock.

So if Seafoam does anything for you, putting in cheap straight isopropanol, which also "binds" water, will do the same thing. There's no magic in Seafoam, you've got all the ingredients at the local hardware store way cheaper.
The above are the primary hazardous ingredients listed on the MSDS. An MSDS should NEVER be taken as a specification sheet as there are nearly always other minor ingredients, often the active ingredients. A product cannot be formulated based upon this information. Sorry.

Seafoam contains some very effective corrosion inhibitors and cleaners that are not on the MSDS listing. This is true of other effective fuel additives. 3rd party testing.

As for the assertion and ethylene glycol butyl ether is a multi-purpose additive, no. It will help with phase separation if enough (too much) is used and can clean varnish, but it will not prevent corrosion or stabilize fuel against oxidation. Glycol ethers are also NC rated for nitrile, neoprene and Viton; that means they are bad for the hoses, needle valve, and diaphragms. You might get away with 1%, but amounts large enough to stabilize phase separation are a bad idea. Oh, if it were only so simple. Good fueling practices are smarter.

(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")

"Well, I just climb up to them."

by Joe Brown, English rock climber




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Last edited by pdqaltair; 04-27-2013 at 09:56 PM.
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