Briggs & Stratton Lawnmower Engine Won't Start

Lawnranger

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Stihl is so serious about octane and ethanol that they now have a fuel blended with Stihl Ultra synthetic oil, 92 octane (R+M/2) and NO ethanol - its called MotoMix and sold through Stihl dealers in quart size metal cans.
 

chance123

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I think perhaps the above mentioned was for California. California has their own set of rules. There are so many engines that I can't get anymore because of California restrictions. I had a customer get his own replacement engine from Az, because it couldn't be sold in Cal. After reading the above posts, I am certain it has to do with the fuel blend that the EPA and California requires.
 

Hagendas

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I just got back from a repair shop that got good reviews on Angie's List. After a few educated questions the gentleman behind the counter came to the conclusion that I have water in my fuel. However his explanation was something I'd not seen before on the forums. He proposed that the water entered into my fuel tank from my recently filled gas can. Apparently Ethanol, a common additive to many gas stations, absorbs water. He says a way water can get into the fuel tanks of stations is when there's a combination of condensation and a recent mixing action of the tank contents from the filling action of a gas truck.

I asked him to look at the engine anyway in case there's another issue besides putting water into my engine via the gas that fuels it. I'll post what the mechanic's claim is once I get a call back from the place.

Well, I got a voice mail from the repair shop. They told me the diaphragm in the carburetor failed and required replacement. I'm picking up the lawn mower tomorrow. Hopefully I'll have his more detailed explanation for everyone once I get home.
 

Hagendas

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Diaphragm got rigid over time and failed. Not the fancy explanation I was originally offered, but it's nice to have some validation that it wasn't something I did or wasn't doing. :smile:
 
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