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/ alandiegonavarro This is not a procedure in the car. The regulator's function is to adjust the pressure in the entire fuel line, from the pump outlet to the injectors. The most common models have two chambers isolated from each other by a diaphragm, where one chamber is in contact with the fuel and the other with the vacuum of the intake manifold. The regulator consists of a membrane (diaphragm) and a spring. This diaphragm controls a valve that opens and closes according to the fuel pressure. When the pressure in the line is below the calibrated pressure in the regulator, the valve remains closed until the pump is able to pressurize the system. Once the ideal pressure value in the line is exceeded, the regulator opens the valve, allowing excess fuel to return to the tank.