What indicates low fuel pressure in the system?

The activation of the fuel boost pump is a key indication of low fuel pressure within the system. When fuel pressure is below a certain threshold, the fuel boost pump is engaged to assist in delivering adequate fuel to the engine. This pump boosts fuel from the tank to the engine, ensuring that the engine continues to receive the necessary fuel flow for proper operation.

If fuel pressure drops significantly, the boost pump operation is a corrective action that seeks to maintain the engine's performance. The design of fuel systems incorporates this feature to provide a fail-safe measure against conditions that could lead to engine performance issues or failure due to insufficient fuel delivery.

In contrast, visual alerts on the dashboard may inform the pilot about various system statuses but do not specifically confirm low fuel pressure without additional context. Automatic engine shut down typically occurs as a last resort for severe system malfunctions, and a manual check of fuel levels generally pertains more to assessing fuel quantity rather than pressure levels directly. Therefore, the activation of the fuel boost pump stands out as a direct indication of low fuel pressure in the system.