I had the same problem but with my Eager Beaver 282 trimmer. I also had a Walbro carb that I rebuilt and fuel lines that I replaced. I checked the on-line manual to make sure the carb and lines were in properly, just like you did. The advice I received was to make sure my lines were not pinched, especially the one that's attached to the fuel pickup/filter in the tank. When I checked that line and was able to let it flow, my trimmer worked.
Let me know how it goes for you.
Copperzad
September 2009
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