Abstract: A centrifugal fluid handling apparatus such as, for example, a centrifugal fuel pump for, for example, an aircraft engine, which includes a impeller rotatably mounted in a housing, with an annular diffuser ring being disposed about a periphery of the impeller. The annular diffuser ring includes at least one passage for discharging a fluid from the impeller, and a passive control is provided in a diffuser throat of the at least one passage at an entrance area thereof for providing a stabilized fluid discharge pressure through the at least one passage throughout an entire flow range of the fuel pump.