well, I work in the small engine industry now. In NC. At the service schools they tell us to 'educate the customer' that most pump gasoline begins to go bad in as little as two weeks from when you get it from the pump. We are also telling our customers to buy 93 octane gasoline or ethanol free gas if they can get it for their small stuff.
I can understand the part about leaded fuel too- a lot of the older engines didn't have valve seats hard enough to withstand unleaded gas and the lead was a lubricant for the valve seats. The trick is to know which engines and with some manufacturers, it depends on what year, and sometimes which engine had the hardened valve seats in it or not.
Most of the gasoline available around here has 10 percent ethanol in it. I am told that they use the ethanol to raise the octane rating of the fuel. So when the alcohol evaporates you have lower octane than when it came out of the pump.
I do find that if I put 93 octane in the tanks of machines I don't use often I am much more likely to get it to start without a lot of fuss two or three months later.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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