Controlling vapor recirculation during refueling of a tank through a filler tube from a dispensing nozzle

A two-stage pressure differential pressure responsive flow control valve is disposed to provide greater fuel vapor recirculation to a tank filler tube when high vacuum conditions are encountered during refueling from a fuel dispensing nozzle inserted in the filler tube. The pressure responsive valve has an obturator with a passage therethrough for providing a relatively low flow rate when the valve is in the closed condition resulting from a relatively low vacuum during refueling. When a higher vacuum is encountered, the obturator is moved to the open position permitting greater flow. Preferably, the pressure responsive valve is disposed in a common housing with a float operated rollover valve.