What is the main function of the cockpit fuel quantity indicator?

The primary function of the cockpit fuel quantity indicator is to display the amount of fuel available in the aircraft’s fuel tanks. This instrument is crucial for pilots to ensure that there is enough fuel for the flight, to plan for fuel consumption, and to determine if refueling is needed before takeoff or during flight. By providing a clear readout of fuel levels, the cockpit fuel quantity indicator helps pilots maintain operational safety and efficiency.

While there are other instruments and systems in the aircraft that may deal with fuel pressure or temperature, those are distinct functions and do not relate to the core purpose of the fuel quantity indicator, which is centered exclusively on the measurement and display of fuel levels.