1- The fuel line with the pickup filter in the tank should be connected to the primer bulb on port marked "tank". 2-The fuel line on the primer bulb marked "carb" should be connected to the rear connection on the carb (closest to chain). 3-The front carb connection (closest to the control end of saw) should be connected to the larger fuel line the enters into the tank. This line returns the extra primed fuel back into the tank.