I have an Echo HC-1500 Gasoline hedge trimmer that has not been run in a couple of years and now won't start. I had to replace the fuel primer bulb because it had cracked. I have cleaned the fuel filter, flushed the fuel lines, disassembeled and cleaned the carb and then reset the carb to manual specs, replaced the spark plug (it is firing), cleaned the magneto and magnets, cleaned the exhaust port screen and pulled and pulled and pulled. It will "fire" on full choke and when taken off choke, will run for about five seconds and die. I can repeat this as many times as I have strength to keep pulling the rope. I have purchased a carburetor repair kit today. I am truly at the end of my starter rope if this does not help. Do any of you have any suggestions?