As I describe in my article on replacing a string trimmer carburetor, it’s cheap and easy to buy a remanufactured unit and drop it in. If replacing the fuel lines doesn’t work, the other likely culprit is your carburetor. At higher throttle, it may suck air instead of gas, leaning out your fuel mixture. Lastly, it may not rev up properly when you give it throttle. The primer bulb also won’t seal properly, so you’ll notice more air than usual when you try to prime the trimmer. It’ll also become fairly brittle, and you may be able to pinch the hose and see cracks. My trimmer has a clear green-tinted line that had started turning brown. So how do you know if your fuel line has gone bad? It can discolor. My chainsaw, on the other hand, sees less use, so I always empty it after use. This worked fine until I forgot to do it last year. It seems like too much of a pain to do this every week. I tend to drain my string trimmer’s tank in the fall and then run it out of gas before storing for the winter. Fuel stabilizers, such as Stabil, can help with this issue.Īs a final aside, because it is prone to collect water and rot your fuel lines, it is recommended to drain ethanol gas from small outdoor power tools. It also has a tendency to attract water, so it is more prone to going bad from sitting than gasoline. Because it is less energy dense than gasoline, it results in worse fuel economy. High-ethanol blends such as e85, which are 85% ethanol, thus lend themselves well to forced induction applications, where the high octane is desirable to prevent pre-ignition.įor the average consumer, ethanol is less desirable. It’s cheaper and more stable (higher octane) than gasoline, but has a lower energy density. Ethanol is a corn-based alternative fuel.
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