I just tried to start my Echo Trimmer up today and found there is no gas getting to the primer bulb. I pressed the bulb about 100 times with the gas cap on and off. Whats the next best thing to do, pull the lines and try to clean them out? (Note: I pulled the spark plug and got a good spark. Put some gas right into the spark plug and it ran and sounded good until that fuel ran out) Ideas/Suggestions?