Which component is NOT powered by the aircraft's electrical system?

The fuel system in most general aviation aircraft is typically powered by mechanical means, such as gravity feed or engine-driven fuel pumps rather than relying on the aircraft's electrical system. While certain components of the fuel system, such as fuel level sensors, may use electrical power for indicators, the actual fuel delivery and operation are generally not dependent on electrical power.

In contrast, components like flaps, radios, and GPS rely on the aircraft’s electrical system to operate. Flaps are usually electrically driven to extend and retract, radios require electrical power to function for communication and navigation, and GPS systems also operate with electrical input to perform their functions. Therefore, it is accurate to say that the fuel system is the component that is primarily not powered by the aircraft's electrical system.