Fuel Filter: Most saws have a small filter screen attached to the end of the fuel-pickup line within the tank. Fish the end of the line out with a piece of bent wire, then pull the screen and its housing off the fuel line. Brush it clean with solvent, and replace it. Now's also the time to check the fuel-cap gasket and the vent, and to drain out the fuel (if it's more than a month or two old) and replace it with a fresh mixture, blended exactly to your manufacturer's fuel/oil ratio specifications.
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