What activates the CAS warning message, FUEL PX?

The CAS warning message "FUEL PX" is activated by the low-pressure switch. This switch plays a critical role in monitoring the fuel system's pressure to ensure that it is within operational limits. When fuel pressure drops below a specified threshold, it triggers the low pressure switch, which in turn causes the "FUEL PX" warning to illuminate in the cockpit.

This warning serves as an important alert to the pilot, indicating that there may be an issue with fuel delivery to the engine, possibly due to inadequate pressure from the fuel system. Addressing this warning promptly is crucial for maintaining engine performance and safety during flight operations.

The function of the other components mentioned, such as the electric boost pump, high pressure switch, and motive flow switch, while important in the fuel system, does not directly cause the "FUEL PX" warning. The electric boost pump contributes to fuel pressurization, the high pressure switch monitors maximum pressures, and the motive flow switch helps with fuel transfer but does not trigger the low-pressure warning.