Self powered fluid metering units

A system (10) includes a metering module (12a) that receives fluid through a fluid inlet and includes a rotating component (28a) driven by the fluid, an electric machine (30a), and a controller (32a). The fluid is received from the fluid inlet at an inlet flow rate, and the rotating component (28a) provides the fluid to an outlet of the rotating component (28a) at an outlet pressure. The electric machine (30a) is configured to generate electrical power in response to rotation of the rotating component (28a). The controller (32a) is powered by the electrical power generated by the electric machine (30a), and controls a rotational speed of the rotating component (28a) to control the outlet pressure.