Winter gasoline blend from up north will have a relatively high Reid vapor pressure to allow the gasoline to vaporize at below zero temperatures. When winter grade gas is exposed to 80+ F ambient temperatures, it soon begins to decompose into volatile (gasoline vapors) and non-volatile components (stinky reddish-blown sludge). Summer gas blend is very different (especially where the EPA mandate low VOCs) and is somewhat more temperature stable. The generally agreed maximum storage time for gasoline 30-45 days. If it is stored longer than that, a fuel stabilizer is recommended. That is one reason it is recommended the generator be run for at least one hour every 30 days so the fuel line is purged of old gasoline.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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