OK my turn HELP!!!!!!!!
I have converted a new Ryobi 31cc from a weed wacker. When I start the engine it will run for about 10 to 15 seconds then die. I noticed that air was getting into the fuel line from the Carb. The only way the engine will start after it dies is to pump the fuel ball pump and it will run for another 15 to 20 seconds. I have tried a different carb, a different rear plate with reed valve and still the same thing. There are two brass lines that come off of the carb. one by the high and low speed adj. and the other is on the other side of tha carb and is bent in a 90 degree angle. which is the feed for the carb? Does anyone know if this is a pressure fuel system where the tank has pressure form the engine? What is the second pipe for if it's not pressure system?

HELP!
Thank You!