I've got a 12.5 Kawi engine that is on a Toro Walkbehind. The machine has sat for the last 3 years in the garage waiting to be used as a backup. It never was and now I've decided to sell it. Here's the problem, when I last ran it I turned off the fuel shutoff and let it run itself dry for storage. This weekend I decided to start it up and get it ready to sell and it started right up on the second pull but only ran for about 30 seconds befor stalling. Upon removal of the air cleaner I discovered the reason was that after it's started (about 15 seconds) there's a white plastic tube that goes into the carb (apparently a PVC) and after the 15 seconds it POURS gas and I think oil into the carb and stalls the motor. It'll start up again, but after 15 seconds here comes the flood again. Does anyone know what this is caused from and how do I fix it.