Which component is not part of the standard requirements for an aircraft's fuel system?

The ignition system is not part of the standard requirements for an aircraft's fuel system because it primarily relates to the engine's operation rather than the fuel delivery process itself. The fuel system’s primary components include fuel tanks, pumps, and filters, which are essential for storing, transporting, and ensuring that the fuel is clean and free from contaminants before it reaches the engine.

Fuel tanks are necessary for storing the fuel required for flight, while pumps are critical for moving the fuel from the tanks to the engine. Filters are vital to remove impurities from the fuel, helping to protect the engine from damage caused by contaminants. The ignition system, in contrast, is responsible for igniting the fuel-air mixture within the engine cylinders, which is separate from the fuel supply and delivery mechanisms. Thus, it does not belong in the list of components that make up an aircraft's fuel system.