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Old 24-10-2018, 10:34   #1
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petrol addative

Will a petrol addative help 1 year old fuel used in a 4 stoke outboard

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Old 24-10-2018, 15:42   #2
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Re: petrol addative

Is it straight gas (petrol)? Or does it have ethanol mixed in?

In the former case, maybe. Might not even need an additive. In the latter case, I'd be skeptical; none of the additives available here that I tried were worth more than about 1 month.

OTOH, that was in a 1-cylinder, 2-stroke, low horsepower carbureted outboard. Perhaps a two- (or more-) cylinder higher-displacement motor, and/or perhaps with fuel injection, the outcome could have been better.

How many gallons or liters, depending on where you are? Most old gas (petrol) will run through cars relatively easily...


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Old 24-10-2018, 15:46   #3
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petrol addative

I have used Sta-bil for lawn motors, weed eaters, blowers, chainsaws etc for years and never had a carb problem.
Maybe Iím just lucky, suppose?
However I do not treat old gas, itís too late then
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Old 24-10-2018, 16:36   #4
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Re: petrol addative

If unknown, how much are we taking about? 2 gallons, 20 or 200? If is for a dingy OB and <5g is that much fuel worth pulling and cleaning the carb, drain fuel lines, replace fouled spark plugs, filters etc etc or just go and buy another $15 worth of fresh fuel?
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Old 25-10-2018, 04:51   #5
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Re: petrol addative

Originally Posted by a64pilot View Post
However I do not treat old gas, itís too late then
This ^^^^^

All of the treatments out there are meant to be put in the gas while it is still fresh. Do this and they can keep it fresh for a very long time. I have never heard of any treatment that will "revive" old gas. Though, as mentioned, if it has no ethanol in it, it might work okay as is.

Personally, I would find a proper place to dispose of it, and get new gas. Even if you're talking about a couple of hundred gallons, that's still a small price to pay compared to ruining your engine.
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