What is the function of the fuel pressure valve?

1 Answers
ErinMarie
07/30/25 4:38am
Fuel pressure valve functions: 1. Ensuring normal fuel pressure in the automotive fuel system: The fuel pressure valve is a component that ensures normal fuel pressure in the automotive fuel system. The pressure regulator contains a diaphragm that controls the opening and closing of the pressure valve. When the fuel pressure drops below a certain value, the pressure valve closes, allowing the fuel pump to pressurize and increase the pressure in the fuel lines. When the pressure exceeds the specified level, the diaphragm opens, and excess fuel flows back to the fuel tank through the return line, thereby reducing the pressure. 2. Regulating the fuel pressure entering the injector based on changes in intake manifold pressure: The fuel pressure valve adjusts the fuel pressure entering the injector according to changes in intake manifold pressure, maintaining a constant pressure difference between the two. This ensures that the amount of fuel injected from the injector depends solely on the duration of the injector's opening time, allowing the ECU to precisely control the fuel injection quantity by adjusting the injection duration.
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