The importance of the Mazda 3 Fuel Pump is that it pumps gasoline to the engine whenever it is required to accelerate or cruise in the car. Most of the carbureted cars of the early periods throughout the world could count on a low-pressure mechanical Fuel Pump mounted outside the tank, the diaphragm or plunger of which was driven directly by the camshaft to provide approximately 15 psi, which was just sufficient to power a carburetor. When electronic fuel injection was adopted, the designers of Mazda changed to an in-tank electric system that rotates at a fast rate, is immersed in fuel to cool itself, and reaches 40 to 60 psi to feed injectors and keep the lively four-cylinder of 155 hp alive. The electric Fuel Pump is connected to the vehicle ECU, which may switch off the power in case of collisions or low oil pressure, and pulse width modulation may also be applied to reduce the output at light load, increasing the life of the pump and lowering the noise. Direct-injection designs add a further stage of high pressure, which is normally mounted on the engine, but the underlying electric unit continues to perform the first stage of transfer between the reservoir, an example of how the pressure requirements determine the pump design. The modern layout is lighter and has fewer vapor locks compared to the dated mechanical style, and causes the least fire hazard due to the wiring in the tank instead of fuel line exits, which Mazda also points out in its service literature. Mazda engineering maintains a compact and quiet system and makes it easy to maintain so that no drive in the 3 will be rough or inefficient.
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