An electric fluid pump for use in a motor vehicle , the electric fluid pump comprising: a pump housing defining a fluid chamber and a motor chamber , said fluid chamber being in fluid communication with a fluid inlet and a fluid outlet for providing flow of a coolant through said fluid chamber ; an electric motor disposed within said motor chamber , said electric motor including a stator and a rotor , said rotor being supported for rotation relative to said stator by a rotor shaft extending along a longitudinal axis through said motor chamber ; a single impeller fixed to said rotor shaft for rotation in said fluid chamber and operable to pump coolant from said fluid inlet to said fluid outlet ; and a controller in closed loop communication with said electric motor ; characterized in that said impeller is operable to rotate in a first rotary direction (CW) and an opposite second rotary direction (CCW) in response to a signal from said controller , wherein the pumping efficiency of the impeller is greater in the first rotary direction (CW) than in the second rotary direction (CCW), so that said first rotary direction (CW) produces a first positive flow rate of coolant outwardly from said fluid outlet and said second rotary direction (CCW) produces a second positive flow rate of coolant outwardly from said fluid outlet , and wherein said first positive flow rate is greater than said second positive flow rate , and in that said controller monitors a real-time rotational speed (RS) of said impeller and compares said real-time rotational speed (RS) with a predetermined target speed signal (TS), said controller commanding said impeller to rotate in said first rotary direction (CW) when said target speed signal (TS) is greater than said real-time rotational speed (RS), said controller commanding said impeller to rotate in said second rotary direction (CCW) when said target speed signal (TS) is less than said real-time rotational speed (RS). a pump housing defining a fluid chamber and a motor chamber , said fluid chamber being in fluid communication with a fluid inlet and a fluid outlet for providing flow of a coolant through said fluid chamber ; an electric motor disposed within said motor chamber , said electric motor including a stator and a rotor , said rotor being supported for rotation relative to said stator by a rotor shaft extending along a longitudinal axis through said motor chamber ; a single impeller fixed to said rotor shaft for rotation in said fluid chamber and operable to pump coolant from said fluid inlet to said fluid outlet ; and a controller in closed loop communication with said electric motor ; characterized in that said impeller is operable to rotate in a first rotary direction (CW) and an opposite second rotary direction (CCW) in response to a signal from said controller , wherein the pumping efficiency of the impeller is greater in the first rotary direction (CW) than in the second rotary direction (CCW), so that said first rotary direction (CW) produces a first positive flow rate of coolant outwardly from said fluid outlet and said second rotary direction (CCW) produces a second positive flow rate of coolant outwardly from said fluid outlet , and wherein said first positive flow rate is greater than said second positive flow rate , and in that said controller monitors a real-time rotational speed (RS) of said impeller and compares said real-time rotational speed (RS) with a predetermined target speed signal (TS), said controller commanding said impeller to rotate in said first rotary direction (CW) when said target speed signal (TS) is greater than said real-time rotational speed (RS), said controller commanding said impeller to rotate in said second rotary direction (CCW) when said target speed signal (TS) is less than said real-time rotational speed (RS). <EOS>