Put your finger over the air intake on the carb,and then try to start it. Then take your finger off, and try to start it (this will bring fuel up to the carb). If it starts then dies, its not continuing to bring fuel to the carb. If it still doesn't start your glow plug is not working. Another way to test the glow plug is to take it out, and stick it in the ignitor. If it glows, or gets real hot, you know its fuel related.