Agreed---Post #1 seems to indicate it has a pressure tank.-----Is tank cap closed with a good gasket ?----If motor runs it must be producing crankcase pressure for the tank.-----There is a blockage or leak somewhere.----Checked fuel filter and strainer inside the tank ?----The pump on the tank pumps fuel only.----When motor starts crankcase pressure puts air into the tank.------This should be simple to figure out.----When motor stops wait 5 minutes to open the tank cap.-----It should hiss from the pressure.-----I suspect there may be a pin hole leak in the pick up tube inside the tank.
