i e fuel which results in a higher pump discharge pressure at the outlet 232 when the valve 250 is closed fig5 the valve impairs the application of a motive fluid from the high speed centrifugal pump outlet 232 to the ejector pump motive port 242 and thereby causes the ejector pump 240 to act as a pass through for inlet flow from fuel inlet 204 which may be received from a separate electric start pump 260 that is separately driven by electric power to the high speed centrifugal pump 230 without an increase to the inlet pressure at inlet 234 to the high speed centrifugal pump in turn the high speed centrifugal pump 230 applies or increases the pressure to the fluid and results in a reduced pump discharge pressure compared to when there is motive flow applied i e when the valve is open as in fig4 while operating in the high pressure mode with the valve 250 open the high speed centrifugal pump 230 generates considerable fuel heating during fuel system operating conditions where fuel temperature is nearing the fuel system icing point the high pressure mode of the pump can be selectively employed to maintain fuel.