Fuel Pressure Control Valve
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The PCM controls the fuel rail pressure by activating the fuel pressure control valve which regulates the fuel pressure in the fuel rails. The PCM regulates fuel rail pressure by controlling the duty cycle of the fuel pressure control valve solenoid. An increase or decrease in the duty cycle maintains pressure in the fuel system or vents pressure to the fuel cooler. A high duty cycle indicates a high fuel rail pressure is being commanded. A low duty cycle indicates less pressure is being commanded. The fuel pressure control valve is mounted on the fuel rail.