Which component is NOT part of the fuel system?

The exhaust manifold is the correct choice for being the component that is not part of the fuel system. The fuel system in a vehicle generally consists of components that are directly responsible for storing, delivering, and mixing fuel with air for combustion. This includes the intake manifold, which directs the air-fuel mixture into the engine cylinders, the air cleaner, which filters the air entering the engine, and the fuel lines, which transport fuel from the tank to the engine.

In contrast, the exhaust manifold serves a different function entirely. It is responsible for collecting exhaust gases from the engine's cylinders and channeling them to the exhaust system for expulsion from the vehicle. Since the function of the exhaust manifold does not involve fuel delivery or air-fuel mixing, it does not belong to the fuel system framework. Understanding the distinct roles of these components is crucial for identifying their functions within an automobile's overall systems.