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This answer relates to an automobile fuel pressure regulator. The most common form of fuel pressure regulator is an inline chamber where the fuel enters before entering the engine. There is a diaphragm that is spring loaded on the side with the spring tension "pointing" at the fuel inlet. Normally, the pressure is preset to a desired pressure reading. Since the fuel pressure created by the fuel pump is higher than the desired pressure, the regulator keeps the pressure to the injectors at a steady desired pressure. Many fuel systems use a vacuum source to the diaphragm also to allow the pressure to go up when the vacuum drops away, such as on hard acceleration. Another feature of most fuel pressure regulators is a return port. This allows fuel in excess of the desired fuel pressure to return to the tank.
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