efficiency the cover impeller and body are structured to axially balance the impeller which is free floating on the shaft of the motor application_number US 84268504 A description turning now to the figures fig1 depicts a cross sectional view of a fuel pump 20 constructed in accordance with the teachings of the present invention notably the fuel pump 20 includes a single sided impeller 50 which greatly reduces the wet circle index from about 1 8 to about 1 1 thereby reducing friction losses and increasing the hydraulic efficiency of the pump 20 typically about 20 35 furthermore the single sided impeller 50 is free floating while maintaining an axial clearance that is sufficient to handle fuels at higher pressure typically about 2 bar or greater as shown in fig1 the pump 20 generally includes a housing 22 which encloses a motor 24 therein the motor 24 is operatively connected to a shaft 26 which defines a central axis 28 of the pump 20 a cover 30 closes off the open end of the housing 22 and includes an inlet 34 for receiving lower pressure fuel a body 70 is positioned inside the housing 22 and inside the cover 30 the impeller 50 is fitted between the cover 30 and body 70 the impeller 50 is fitted on the shaft 26 for rotation as well as axial translation relative to the shaft that is the impeller 50 is free floating on the shaft 26 as previously mentioned turning now to fig2 an exploded view of the cover 30 impeller 50 and body 70 is shown in perspective it can be seen that the impeller 50 includes a cover side surface 52 which defines an impeller flow channel 58 therein the impeller flow channel 58.