A Fuel Pump can be a mechanical or electrical device component of the fuel system that forces fuel from the tank to the carburetor or fuel injection system.
- Most of the carbureted fuel systems make use of a mechanical fuel pump which is usually located on the side of the engine cylinder block. An eccentric on the camshaft functions the pump. A rotating pushrod moves the rocker arm up and down which flexes a diaphragm to produce pumping action.
- Some types of overhead-camshaft engines have the mechanical fuel pump is located on the side of the cylinder head.
- An eccentric on the overhead camshaft operates the fuel-pump rocker arm.
- The electric fuel pump is composed of an electric motor solenoid to produce pumping action. The advantage of this type is that; fuel is delivered as soon as the ignition switch is turned, and it can always provide more fuel than the engine requires.
- An impeller provides the pumping action for an electric fuel pump. The fuel is compressed from the pump to the engine which helps prevent vapor lock
- A bad fuel pump can prevent the vehicle from starting.