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An apparatus for pumping recovered vapor in a vapor recovery liquid fuel dispenser includes a liquid fuel dispenser apparatus adapted to dispense liquid fuel to a liquid fuel dispenser nozzle proximate a fuel vapor passage. A transducer associated with the dispenser apparatus generates a liquid fuel

An apparatus for pumping recovered vapor in a vapor recovery liquid fuel dispenser includes a liquid fuel dispenser apparatus adapted to dispense liquid fuel to a liquid fuel dispenser nozzle proximate a fuel vapor passage. A transducer associated with the dispenser apparatus generates a liquid fuel flow signal indicative of the rate of liquid fuel flow therethrough. A vapor pump driven by an electric motor is arranged to pump vapor from the vapor passage through a vapor pump inlet to a vapor pump outlet and has a characteristic that the flow rate through the vapor pump at a given vapor pump operating speed is inversely proportional to the difference between the vapor pump inlet and outlet pressures. Sensors associated with the inlet and outlet ascertain inlet and outlet pressures and generate signals representative thereof. A controller for the vapor pump includes vapor recovery control electronics and motor drive electronics. The vapor recovery electronics receive the pressure signals, a vapor pump speed signal and the liquid fuel flow signal and output a motor velocity modulation signal to the motor drive electronics to correlate the vapor pump flow rate with the liquid fuel flow rate. The motor drive electronics convert the motor velocity modulation signal to a voltage drive signal to the motor to adjust the vapor pump operating speed. Any discrepancies between the vapor pump flow rate derived from the pressure signals and the liquid fuel flow rate are thereby reduced.

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An apparatus for pumping recovered vapor in a vapor recovery liquid fuel dispenser comprising a vapor passage, a vapor pump arranged to pump vapor from said vapor passage through a vapor pump inlet to a vapor pump outlet and having a characteristic that the flow rate through the vapor pump at a give

An apparatus for pumping recovered vapor in a vapor recovery liquid fuel dispenser comprising a vapor passage, a vapor pump arranged to pump vapor from said vapor passage through a vapor pump inlet to a vapor pump outlet and having a characteristic that the flow rate through the vapor pump at a given vapor pump operating speed is determinable from the difference between the vapor pump inlet and outlet pressures, a signal source to generate a desired vapor pump flow rate datum, sensors associated with said inlet and outlet to generate signals representative of the inlet and outlet pressures, and a controller for said vapor pump arranged to receive the pressure signals and the desired vapor pump flow rate datum and adapted to adjust the vapor pump operating speed to reduce any discrepancies between a vapor pump flow rate derived from the pressure signals and the desired vapor pump flow rate datum.