Hi, I have a small chainsaw PowerMac 310 with a walbro carb. I just rebuilt the carb gaskets except for a new needle. I put in new fuel filter and inspected the fuel lines. Saw runs great once started, but will not cold start. Hi and low are both adjustable and out about 1.5 turns. The saw is not getting fuel at the plug when I try to cold start the saw, about 30 pulls and no fuel on the plug. There is no primer, just a manual choke. Do you think this is a needle problem or a fuel line issue? Fuel lines look good, but maybe they are collapsing?