I have tried every possible thing I can think of: new spark plug, checked compression, replaced all gas lines, replaced primer bulb, disassembled and cleaned carb, changed gas. Saw will start, but it will only burn the gas from the primer bulb. Throttle works fine, and I can keep the saw going if I gently keep pumping the primer bulb. As soon as I stop, the saw stalls out. Obviously the carb is not pulling the gas from the bulb, but I dont know what else to do.
Don't know the exact carb you have, (Zama, Walbro, Tilliston) but with any of these the diaphragms and gaskets, (there are both pump and shut off) will dry out and and either not stretch properly or not seal properly. They may look good, but will not function. Another problem customers make when they take them apart, is that they put them back together wrong. If you reverse the gasket and the diaphragm, on either side they will not work.
