Just got my Stihl combination weed whacker/brush cutter back from the local Stihl authorized shop. The primer bulb was totally inoperable due to some major cracks and holes in it. Was advised the ethanol in the fuel is doing considerable damage to plastic parts and that shop is being deluged with small engines being damaged by the fuel. Long term storage without totally emptying ALL the fuel apparently takes it's toll on these saws. However I've had one of the older Stihl chainsaw for well over 30 years and have NEVER emptied the fuel tank or lines and just only recently had to finally replace the fuel lines and have the carb rebuilt. Pretty lucky I guess.