I am having a problem with regular unleaded 87 octane gas (10% ethanol) when I mix it with Sta-Bil fuel stabilizer. The problem isn't in my hot rod, but my lawn mower. The fuel bowl keeps filling up with what looks like yellow colored flakes and grit. I filled my 5 gallon gas container last week from the gas station that I always fuel my cars up at. Mixed in Sta-Bil, since 5 gallons lasts me an entire Summer and/or winter (lawn mower through early December then the snow blower in mid December). Last night my mower was running like shit. I dropped the fuel bowl and it's filled with small yellow flakes and grit. The flakes reminded me of scaling. The same thing happened to me earlier this Summer and I assumed it was because I had older gas (with Sta-bil mind you) in the 5 gallon container. I don't know if I got to the station right after the tanker had filled their tanks and stirred up sediment or what. I would assume the pump filters would have caught any of that though. The station does a very high volume so I doubt the age of the gas was a factor. Does Sta-bil itself go bad? I've had the same container for about 5 years.