[lonewolf]

your model might have a fuel shutoff valve mine does under tank.
if not you could try clamping rubber line
needle and seat control fuel going into carb . if you undo screw and it constantly pours out then needle is stuck open and fuel level is to high in bowl and thats why it won,t start

if you undo screw and no fuel comes out then needle is stuck closed . common . from draining fuel, needle closes and then is stuck . either tap on float bowl to free up or remove and just push up