@meca_systema: An electric fuel pump supplies the fuel to the injectors at a defined pressure. The injectors spray the fuel into the intake manifold, or directly into the combustion chamber. The fuel pump is controlled by the fuel pump relay. Once the ignition is turned ON, the ECU/PCM sends a signal to the fuel pump relay to energize it and send voltage to the fuel pump to pump fuel into the fuel system so the vehicle will start and run. After the fuel pump is turned on it will remain on until the ignition is turned off. Pressure is controlled in the system by use of a fuel pressure regulator that bleeds off any fuel pressure that is not needed to maintain a specific fuel pressure. #automotive #fuelpump #mechanic #gasoline #efi #fuelinjection #spark #ecu #pcm #electricfuelpump #fuelsender #automobileengineering #automobile #mecanica #systema