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That's a good question. A friend claimed it could last more than five years. I think a year is no problem in most cases, but the more gas in the tank, the longer it will last. In a lawn mower it might go bad over winter. If you suspect the gas is bad, I have a test you can try. Either open a fuel line, or syphon out a little gas into a small metal jar lid. Move the lid outdoors to somewhere away from anything flammable. Keep a fire extinguisher or at least a garden hose handy. Then light the gas with a match or lighter. As you bring the flame toward the gas, the fire should jump fast to the gas. An audible "poof" is a good sign the gas is okay. If the gas is slow to light (like a candle) your gas is very weak. If you decide the gas is bad, you can drain the gas tank by sucking through the short syphoning pipe located on or near the fuel pump mounting flange. That pipe is usually capped with a hose-like plug.
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