Question about Poulan Pro 42CC 2 Cycle Chainsaw, 18"

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Poulan Pro Chainsaw(PP4218AV) worked for a while now won't start

For a Poulan Pro Chainsaw,(PP4218AV) started up after a season in storage, put in fresh gas mix, filled the chain oil, ran for about an hour but shut off after a while when the trigger released. Rested ~1h, then it was difficult to start, but ran for a few minutes. The saw suddenly slowed and lost power, stopping entirely, and I haven't been able to restart it. Cleaned the air and fuel filters as well as the fuel tank vent hole. The fuel lines are like new. The fuel tank seems to become pressurized, releasing a quick burst on loosening the cap after trying to start it for a while. Any ideas?

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It's possible that the carburetor diaphragm in the lower chamber has hardened or cracked. Does the primer bulb fill with fuel after several pumps? If not, try moving the line that comes up from the fuel filter to the carburetor over to the primer port that normally connects to the other carburetor connection. Try to pump fuel again--if successful, then there is blockage within the carburetor which should be cleaned with spray carburetor cleaner inside and out. There is a small filter screen inside the main body that can be easily plugged with stale fuel. Hope this helps!

Posted on Jul 11, 2010

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