What item is not a part of the fuel system?

An item that is not part of the fuel system is the ignition system. The fuel system primarily includes components such as the fuel tank, fuel pump, fuel injectors, and fuel filters, which work together to deliver fuel to the engine. The ignition system, on the other hand, is responsible for igniting the fuel-air mixture in the combustion chamber, involving components like spark plugs and ignition coils.