Soar to New Heights with the 2025 Commercial Pilot License (CPL) Practice Exam – Ready for Takeoff!

The primary function of the fuel pressure gauge is to indicate fuel pressure to the carburetor. This gauge provides critical information about the pressure of the fuel being delivered to the engine, which is essential for optimal engine performance. Maintaining the correct fuel pressure ensures that the carburetor receives an adequate and consistent supply of fuel necessary for efficient combustion.

Proper fuel pressure is vital because too low a pressure can lead to engine starvation, causing performance issues or engine failure. Conversely, excessively high pressure may flood the carburetor, leading to poor engine function. Therefore, the fuel pressure gauge serves as an important diagnostic tool that pilots use to monitor engine and fuel system performance, helping them make informed decisions during flight operations.

The other options do not accurately describe the function of the fuel pressure gauge. For instance, measuring fuel temperature is important, but it is not the role of the fuel pressure gauge. Similarly, while there are gauges designed to display the amount of fuel in the tank, that is not the purpose of the fuel pressure gauge. Controlling fuel flow rate is also typically managed by other systems rather than indicated directly by the fuel pressure gauge since the gauge merely reports pressure levels rather than actively controlling fuel delivery.