I can offer you something to try. First make sure the main fuel inlet line comming from the tankis hooked to the inlet that isopposite side of the adjustment screws. Then attatch a 2" line to thebrassfuel tubethat exits near the adjustmentneedles. Using a syringe you will hook that to the 2" piece of fuel tubing that exits near the adjustment screws. Pull the syringe out which willdraw fuel from the tank and thru the carb and up into the syringe. Nowusing the syringe you will push just a bit of thefuel back into thecarb,but leavingthe syringe about half full. Nowyou should be able to start the engine and keep feeding the engine with the syringe to keep it running. The idea is to get the gas and oil to soften up the diapram and seals until it starts pumping fuel on its own inthe event that your carb was just really dry from sittng for an extended period of time.This is also the same method I use to prime my engine since thecarb is in aspot that is tough to getto. The primer line works great. I also had to use this method to help keep my engine runningwhen I started my Ryobi the first time as an airplane engine and had to do major adjustments. Just something you may want to try to see if your carb will start to pull its own fuel after you assist it a couple times with the syringe.