The fuel injection nozzle itself, which can be either gasoline or diesel is stored in the fuel tank. A fuel pump push the fuel from the tank through the fuel lines and fuel filter delivered. After the fuel filter would pass the carburetor or fuel injectors, and then sent into the combustion cylinders.

The main part of the fuel system is the fuel. Most car containing a fuel tank located in the rear of the vehicle. At present, the tank developed by automobile manufacturers have internal baffles to prevent fuel from wet. Internal baffles are damaged can cause unwanted noise in the rear when accelerating or when slowing down. Standard fuel tank containing fuel filler tube, onto the engine fuel lines and ventilation systems. Vehicles with catalytic converter equipped with a barrier that prevents the fuel filler pipe lead - dispensed from the nozzle thicker - to enter the fuel system. Fuel lines, made of metal or rubber hoses deliver fuel from the fuel tank of an internal combustion engine.

Other parts of the fuel system is the fuel pump. Most modern fuel systems such as delivery valve system uses two types of fuel pumps, mechanical fuel pumps and electric. Fuel injected cars use electric fuel pumps, while most of the cars that use carburetors equipped with a mechanical fuel pump. Mechanical fuel pump diaphragm pump mounted on the engine and is usually operated by an eccentric cam camshaft. Electric pumps can be found anywhere on the vehicle as they type fuel pump that is not dependent on eccentric operation, but usually electric pump near the fuel tank.