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Old 06-20-2012, 12:11 AM   #1
clinttoney
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When does gas go bad?

Ok I have been told by a respectable Bike Mechanic that is takes 3 weeks, for the gas that we get now with good old ethnol in it, too gum up in carbs. My question is how long does it take that gas to turn to caca in a tank?
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Old 06-20-2012, 01:18 AM   #2
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never if u just add some stabilizer.
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Old 06-20-2012, 01:24 AM   #3
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never if u just add some stabilizer.
Don't petroleum companies do that for you?
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Old 06-20-2012, 01:32 AM   #4
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Don't petroleum companies do that for you?
that would mean the end of STA-Bil ? Phase separation occurs when the fuel comes in contact with water. Either moisture or Humidity. When you pop your gas tank open to refill it. Humidity from outside enters the tank. Because it is in the air.
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you need to tell trey, "stop asking asian riders for BP dummies"...

Last edited by CombatM0NKEY; 06-20-2012 at 01:36 AM.
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Old 06-20-2012, 03:02 AM   #5
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Always keep a gas tank full..and if you don't use it in a week or 2 then just drain it. Gas these days can hurt with all the additives. I left gas in my dual sport bike for a month and it got gummed up so I have to pull the carburetor off to clean..
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Old 06-20-2012, 03:56 AM   #6
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wow in a month? I've let mine sit for almost a year and started right up. I put stabilizer and sea foam each tank of gas religiously though.

But yea.. aside from gumming, other things would be... deterioration of rubber parts (Gaskets, seals, etc.) and copper/brass parts.. not to mention fuel lines get brittle unless u have the braided ones.
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Old 06-20-2012, 07:42 AM   #7
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Many things happen to cause gasoline to go bad, and they don't all happen at once. Usually, the first thing is losing the more volatile fractions. Gasoline is a multi-fraction fuel, with the higher fractions being more volatile and easier to evaporate and ignite, whereas the lower fractions have higher ignition temps and more difficult to turn into vapor phase. When gasoline starts losing the higher fractions, the engine will get harder to start and may not run properly. Gets worse and it may not start at all.

Carbs are more susceptable to bad gas, mostly because of all the tiny passage ways and the float bowl that can be fouled up by bad gas. FI tend to flow fuel at higher pressures and the injectors forces fuel to atomize a lot more efficiently, so they are more tolerant of bad gas than carburetors.

My 05 Gixxer track bunny sits around for months and still start up fairly easily and run good. I do start the engine every week to check, and I do drain the tank when I don't expect any track days for 3-4 months straight.

How quick gas goes bad depends on how it is stored. Many vehicles these days have fairly airtight fuel tanks with vapor recovery systems, so gas tend to stay good for longer periods. Small garden equipment with essentially open gas tanks don't fair as well.
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Old 06-20-2012, 07:47 AM   #8
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you would be surprised at how much water is in the ethanol adulterated fuels we use now, and the alcohol actually soaks it up. Even using stabil wont stop phase separation, though it can help. I have seen gas go bad in as quick as a week, though it was probably very marginal when it came out of the pump to go that fast, and some takes a lot longer to go bad.
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Old 06-20-2012, 08:02 AM   #9
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To get the freshest stock, get gas at name brand station on a busy intersection with a lot of traffic.

I fuel up my cars at my neighborhood Kroger pumps, where cars typically line up 3 deep during the day. We go late at night to avoid the crowd.
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Old 06-20-2012, 10:10 AM   #10
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Another thing is fuel lines. I bought & installed some new Motion Pro (clear) lines and a few months later they were rock hard! wth
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Old 06-20-2012, 11:05 AM   #11
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I've got a bunch of bikes. Even with Stabil and Seafoam the carbed ones can give me trouble after only a few weeks. Ethanol sucks.
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Old 06-20-2012, 11:31 AM   #12
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Quote:
Originally Posted by clinttoney View Post
Ok I have been told by a respectable Bike Mechanic that is takes 3 weeks, for the gas that we get now with good old ethnol in it, too gum up in carbs. My question is how long does it take that gas to turn to caca in a tank?
the trick is, empty the carbs before leaving it in the garage
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nevermind ima bumbass and ill get my wife 2 do it 2nite.
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Old 06-20-2012, 01:03 PM   #13
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When does gas go bad?

When it doesn't have both parents still at home
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Old 06-20-2012, 07:27 PM   #14
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I have even heard that seafoam will gum up carbs!
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Old 06-20-2012, 07:59 PM   #15
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I have had several bikes sit for months without the gas being an issue.
The last one was a 09 KLR 650 its carbed.
Sat from Thanksgiving to Easter, fired right up but you could tell it was a little off of 100% , Cleared out with some new gas and riding.
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Old 06-20-2012, 08:28 PM   #16
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Some caebed bikes are less prone to issues than others depending on if the have smaller pilot circuits.
I've seen some Suzukis, Bandits and Katanas in particular, have issues after only a few weeks.
The ethanol attacks rubber and plastic components as well. It's a fuel that causes more issues than is allegedly solved.
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Old 06-21-2012, 12:54 PM   #17
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According to my wife, my gas is always bad!
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