107 and outlet 109 conduit inlet 108 and outlet 110 check valves and displacement cavity 104 are completely filled with the fluid 103 to be pumped the shape memory alloy wire 114 is at ambient temperature and thus in a state of maximum length correspondingly the position of the plunger 112 is such that the volume of the displacement chamber 104 is at its minimum value the biasing spring 115 is in a compressed state such that it exerts a force on the plunger 112 consistent with a state of minimum volume of the displacement cavity 104 operation of the device involves first a heating of the shape memory alloy wire 114 to a temperature and for a period of time sufficient to induce phase transition and an associated dimensional change heating of the shape memory alloy wire 114 is accomplished by passing an electric current though it the duration of the electric heating period is preset and is controlled by the timing and switching circuit 118 the dimensional change of the shape memory alloy wire 114 will result in the movement of the plunger 112 against the opposing force of biasing spring 115 so as to vary the volume of the displacement chamber 104 toward its first limit 105 and a state of maximum volume as the volume of the displacement cavity 104 is increased fluid 103 is drawn into the displacement cavity 104 from the fluid reservoir 102 through the inlet conduit 107 and inlet check valve 108 fluid 103 is not drawn into the displacement cavity 104 through the outlet conduit 109 due to the one way flow restriction of the outlet check valve 110 after the preset duration the current is then switched off by the timing and switching circuit 118 allowing.