The electric fuel pump, is most most common pump used today. These kind of pumps, are generally used in fuel injection system. It creates the high pressure, to deliver the fuel out of the pump. This high pressure may cause the fuel; to ignite inside the pump itself and be a reason of explosion. Thus, for safety purpose the electric fuel pump is kept; far from the engine and more specifically, it should be kept inside the fuel tank.
The current to operate the fuel pump, is supplied by the battery of the vehicle. An electronic control unit (ECU) is also used to properly control the output pressure and volume of the fuel. In addition, it also meters the incoming fuel from the tank. The (ECU) helps the vehicle to save fuel and hence, gives better mileage and power.
Mechanical Pump
The mechanical pump’s operation is reliant on the up and down movement of a lever, very much like that of a well pump handle. The pump lever’s movement acts on a rubber diaphragm; used to create the vacuum pressure necessary to move the fuel.
Mechanical pumps operate at a low 3.5 to 9 PSI of pressure, with the main emphasis on volume (GPH) rather than pressure. The pump chosen for a particular engine; must provide sufficient volume to accommodate the expected fuel flow for the size of the engine in cubic inches.
