The purpose of a fuel system is to stock the fuel and supply it to the cylinder chamber allowing the engine to produce energy. Typically, a fuel system consists of a fuel tank, fuel pump, fuel rail, and fuel injector. A fuel tank is the starting point of the fuel system, and the fuel is stored inside this tank. Since the distance between the engine and the fuel tank is pretty long, the car needs great pressure to deliver the fuel to the engine. This task is performed by the fuel pump that creates extreme pressure to provide the right amount of fuel. The fuel rail measures the fuel pressure and releases just the right amount of fuel for the engine. After the fuel rail, the fuel meets the fuel injection that turns the gas or liquid into a spray form and injects it into the cylinders.