I got a portable inverter generator a few years ago. Works very well and always starts within 2 pulls(usually 1) on FRESH gas. There have been times when I have let the gas get 2-3 months old and then tried to start it. Would not start, even with many pulls, different choke settings etc.
Drain the old gas, put in fresh and it starts on first pull.
Same scenario, at least 3 times now so I am certain that the gas is degrading and some of the vapors that were present when it was fresh, are no longer there, after it has set for 2-3 months.
NOTE: This degradation may not occur as rapidly in a modern "sealed" fuel system, where "there is no place for the vapors to go" and the effect is probably minimized by a FI system that atomizes the fuel much better, but in old stuff it is a major issue.
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