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A rotary hydraulic vane pump includes a rotor mounted within a housing, with a plurality of vanes individually slidably disposed in corresponding slots in the rotor periphery. A cam ring surrounds the rotor within the housing and has a radially inwardly facing vane track defining as least one arcuat

A rotary hydraulic vane pump includes a rotor mounted within a housing, with a plurality of vanes individually slidably disposed in corresponding slots in the rotor periphery. A cam ring surrounds the rotor within the housing and has a radially inwardly facing vane track defining as least one arcuate fuel pressure cavity between the rotor and the cam ring. A fuel inlet in the housing includes a primary inlet port opening into the cavity at the leading circumferential edge of the cavity with respect to the direction of rotation of the rotor within the housing. A pump outlet includes an outlet port that opens into the cavity adjacent to the trailing circumferential edge of the cavity. A secondary inlet port opens into the cavity circumferentially between the primary inlet port and the outlet port, and is directly connected to the pump outlet port such that fluid, at outlet pressure is available at the secondary inlet port. A pressurization valve, having a predetermined threshold pressure for permitting flow of fluid therethrough, is connected between the pump outlet and the primary pump inlet port.

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A two-stage fuel pump for aircraft turbine engine applications comprising: a housing having a pump drive shaft mounted for rotation about its axis within said housing, a vane pump stage that includes a rotor coupled to said shaft for continuous rotation within said housing and having a plurality of

A two-stage fuel pump for aircraft turbine engine applications comprising: a housing having a pump drive shaft mounted for rotation about its axis within said housing, a vane pump stage that includes a rotor coupled to said shaft for continuous rotation within said housing and having a plurality of radially extending peripheral slots, a plurality of vanes individually slidably disposed in said slots, means forming a cam ring within said housing surrounding said rotor and having a radially inwardly directed surface forming a vane track and at least one fluid pressure cavity between said surface and said rotor, and vane pump fluid inlet means and outlet means in said housing, a centrifugal pump stage that includes an impeller coupled to said shaft for continuous rotation within said housing and having a circumferential array of radially extending passages formed therein, and means for continuously feeding fluid from said vane pump outlet means to the radially inner ends of said impeller passages, a pump fluid inlet in said housing including means for feeding inlet fluid to said vane pump fluid inlet means, and a pump fluid outlet including means in said housing for receiving outlet fluid at elevated pressure from the radially outer ends of said impeller passages, both said vane pump stage and said centrifugal pump stage being operable in all phases of operation of said two-stage pump to pump fluid from said fluid inlet through said vane pump and then through said centrifugal pump to said fluid outlet such that all fluid pumped by said two-stage pump passes through both said vane pump stage and said centrifugal pump stage.