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| Semi-old gas? (Page 2/2) |
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sleek fiero
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APR 02, 10:49 AM
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A year is not a problem. Best way to put away is with the tank full so little air (oxygen) in tank to spoil fuel. Best way for multi year long term is to drain system and start and run dry.so no fuel in tank ,lines, or injectors to go bad. Fuel stabilizer is good short term but is not effective long term. Our fuels now a days has methanol in it and will cause severe corrosion if it goes bad from age. Methanol is a moisture attractant. sleek
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Vintage-Nut
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APR 02, 11:14 AM
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Gasoline lasts about 3 to 6 months in the tank
Adding a fuel stabilizer to fresh gasoline will extend its life to around 2 years
{A fuel stabilizer will NOT help aged gas}
For the most part, aged gas just loses some of its ability to combust and tiny engines suffers more than bigger engines
The best way to make aged fuel usable again is to dilute it with fresh gasoline
| quote | | bad gas is worse for carburetors than injection systems, does that sound right? |
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Aged gasoline 'thickens' in a carburetor and forms varnish-like substances which will clog the tiny fuel pathways so to me, yes - it is worst
{I always treat carburetor vehicles with fresh gasoline with a stabilizer before storage}
The biggest problem of 'semi-gas' is moisture {aka water} and especially with fuels with ethanol.
Like brake fluid, ethanol is hygroscopic, which means it attracts and absorbs water molecules from the surrounding atmosphere.
Moisture contamination leads to corrosion or ‘rusting’ of metal components; especially the fuel tank....------------------
Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles
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1985 Fiero GT
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APR 02, 12:19 PM
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| quote | Originally posted by sleek fiero:
Our fuels now a days has methanol in it and will cause severe corrosion if it goes bad from age. Methanol is a moisture attractant. sleek |
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As far as I know, it's ethanol not methanol, maybe they put a little methanol in to, but it isn't enough to matter, they commonly use 10% ethanol.
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Doggo
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APR 02, 05:32 PM
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| quote | Originally posted by sleek fiero:
Best way to put away is with the tank full so little air (oxygen) in tank to spoil fuel. |
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Wow I accidentally did it right? Cool!
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Doggo
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APR 02, 05:38 PM
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| quote | Originally posted by Vintage-Nut:
tiny engines suffers more than bigger engines
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By ‘tiny’ engines you mean like small engines, right? (Lawnmower, snowblower) not like a tiny 4 cyl vs a bigger v8
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Doggo
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APR 02, 05:40 PM
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| quote | Originally posted by Patrick:
but in the early 2000's I resurrected my '84 that had been sitting for eight years. I simply added fresh fuel to the old stinky stuff, and it ran just fine. YMMV |
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What kind of environment was the car left in? Garage? Field? Exposed to elements? I’m curious
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Patrick
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APR 02, 06:00 PM
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| quote | Originally posted by Doggo:
What kind of environment was the car left in? Garage? Field? Exposed to elements?
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Garage? Ha, I wish! It sat out in the open in my backyard.
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Vintage-Nut
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APR 02, 07:13 PM
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| quote | By ‘tiny’ engines you mean like small engines, right? (Lawnmower, snowblower) not like a tiny 4 cyl vs a bigger v8
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You're correct; when I say ‘tiny’ engines, I mean like garden equipment. 
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sleek fiero
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APR 02, 09:01 PM
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Yes Vintage I meant ethanol Not methanol comes in most pump fuels now. But methanol (methall hydrate) is used to soak up water and burn off as you run your car. It will also cause corrosion. BTW fuel including diesel will start going stale before you even buy it.. Stabilizer certainly will help but old fuels do rot senders ,hoses, tanks and pressure regulators.
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