• Hard to tell. I've heard that it does, but we have a generator that had 3yr old gas in it. I fired it up last week and it started on the first try, then ran perfectly. I've heard it has a one year life, but I store gas for emergencies, and after 18months in jerry cans it still worked fine in my car. The secret is to keep the water out of it. There is fuel stabalizer that you can use, and that can keep the gas good for a long time. However, the gas I stored for 18months had nothing in it top stabalize it and it still worked fine. If you don't protect the fuel from the elements, however, it can become gummy. This will clog up fuel injectors if you put it in a vehicle. It can also get diluted due to water. However, gas is gas and my dad and uncles believe it's basically good forever (the difference in generations...) This is a quote from wikipedia: When gasoline is left for a certain period of time, gums and varnishes may build up and precipitate in the gasoline, causing "stale fuel." This will cause gums to build up in the cylinders and also the fuel lines, making it harder to start the engine. Gums and varnishes should be removed by a professional to extend engine life. Motor gasoline may be stored up to 60 days in an approved container. If it is to be stored for a longer period of time, a fuel stabilizer may be used. This will extend the life of the fuel to about 1-2 years, and keep it fresh for the next uses. Fuel stabilizer is commonly used for small engines such as lawnmower and tractor engines to promote quicker and more reliable starting. Hope that clears it up a bit.

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