If the gas got old inside the machine, it probably clogged the orifices and dried up the diaphragms. Pull it off, take it apart and clean the whole thing with warm water and soap, after blow dry with the air compressor. Replace everything you get with the rebuild kit, should start right up. I have the same problem, I cannot find the rebuild kit though! I suggest you get a soccer ball/basket/football air attachment, it is needle thin, allows air through with the compressor nozzle, fits beautifully inside the orifices and helps you pinpoint the spots that need to be cleared.