Originally Posted by ronin
Has the saw been sitting around for an extended period of time with the gas still in it? The carb may be gummed up.
Originally Posted by TromboneAl
Right. No, I drained the gas, and it's only been a month or so.
In any case, I got the chainsaw running again, so the gas is A-OK. I don't know exactly what the problem was, but I fished out the fuel filter, and took it apart. It looked fine. I put it back in, put gas back in and it works OK now.
Some two-stroke oils already contain a fuel stabilizer, but I don't know if that applies to your brand, Al.
I had a weedwhacker go bad with similar symptoms, but the cause was plastic fuel lines that had gradually gummed up and become too restricted to let the fuel flow. The plastic pumping bulb no longer did its thing. I cannibalized an old weedwhacker for two lengths of tubing and re-used the fuel filter, but I've seen fuel-bulb/line overhaul kits at Lowes & Home Depot.