How long is it safe to let gas sit in carb? - Snowblower Forum : Snow Blower Forums
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post #1 of 28 Old 02-15-2018, 01:21 PM Thread Starter
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How long is it safe to let gas sit in carb?

About how long is it safe to allow non ethanol gas to sit in your carb between snow storms?

Last time I used the machine was 4 weeks ago. Am thinking I better go start it up and let it run for awhile.

Actually bought the gas approx 80 days ago in total. I did put some Napa brand gas treatment in it at the time.


I know many guys recommend runnning the carb dry after each use and will start doing that I think. Last time I tried it I was kind of unnerved by how loudly and erratic the combustion bangs were and fearing engine damage quickly re-opened the fuel valve and then shut it down normally.
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post #2 of 28 Old 02-15-2018, 01:27 PM
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I use non ethanol and never drain my tanks/carbs. Never have had any rust or starting problems. Before switching to E free gas I always used gasoline treated with Startron and Seafoam. No problems.. Many here will disagree but this works for me. "If it ain't broke don't fix it."
Note: I still use Startron in the E free gasoline, at least until I use up the two bottles I have.

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post #3 of 28 Old 02-15-2018, 01:30 PM
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When you get done turn off the fuel valve and let the engine starve it self oot. as for the main tank itself it does not matter.

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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post #4 of 28 Old 02-15-2018, 01:31 PM
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I find it's best to turn the fuel shut off valve to the off position while the machine is running so the fuel in the bowl gets consumed. Just remember to turn the valve back to the on position when you restart next time. A habit you will get used to.
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post #5 of 28 Old 02-15-2018, 01:40 PM
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I use non-ethanol gas with seafoam, for all my mowers and snowblowers.

For the snowblower (1971 Ariens) it sits about 7 months in the off-season, March to October.
For annual Autumn prep (grease, oil, lube, oil change, etc) I drain the gas tank but *dont* mess with the carb.
Do all the maintenance..fill with fresh gas..fires up fine.
the only "old" gas is in the carb, quickly burned off and replaced with fresh gas.

For the mowers (1964 Wheel Horse tractor and 2006 Craftsman push mower) they sit about 5 months in the off-season, November to April.
For annual Spring prep (grease, oil, lube, oil change, etc) I drain the gas tank but *dont* mess with the carb.
Do all the maintenance..fill with fresh gas..fires up fine.
the only "old" gas is in the carb, quickly burned off and replaced with fresh gas.

I never actually empty the carbs..ever.
Been working fine for 12 years now.

Scot


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post #6 of 28 Old 02-15-2018, 02:01 PM
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I never empty the carb, shut off fuel or run it dry during the season. For summer storage, I leave the tank about half full, add stabilizer, and run it for about 5 minutes. Has worked for 40 years and counting.
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post #7 of 28 Old 02-15-2018, 02:09 PM
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I've let fuel with up to 10% ethanol in it sit in the tank and carb for up to a year and a half and have never had an issue. Sure it smelled bad when fired it up, but it still ran.
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post #8 of 28 Old 02-15-2018, 02:24 PM
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I use non-ethanol gas and a stabilizer, whatever's on sale and don't drain or run dry anything. Only carb problems I have is when I buy a machine I don't know the history of. Once I've cleaned or replaced the carb, no problem everafter!
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post #9 of 28 Old 02-15-2018, 02:34 PM
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Garage
I'd be concerned if it was over 3 months, but as the others have said, if you can run the carb dry by using the shut-off valve, that would be better.

Using fuel stabilizer also puts you in a better situation with layups.

Regards, Ted
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post #10 of 28 Old 02-15-2018, 03:54 PM
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Ethanol fuel has a shelf life of 90 days before it starts breaking down and causing problems. If you add stabil to the fuel it gives the fuel a shelf life of 2 years (24 month's). Always use stabil and if in doubt just turn the fuel shut off closed and run the machine dry, in case their is no more snow and you forget, this way your safe either way.
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