What is the normal fuel pump pressure for a car?

1 Answers
DePresley
07/30/25 6:05am
Generally, the normal fuel pressure for a car ranges between 300-350 kPa (the specified pressure may vary for different vehicle models). Below are specific details about fuel pressure: 1. Hazards of abnormal fuel pressure: If the pressure is too low, the fuel injector may spray weakly or not at all. If the pressure is too high, it can damage the fuel lines or the fuel injector. 2. Working principle: The fuel pressure is regulated by the coordination between the spring and the vacuum in the air chamber. When the fuel pressure exceeds the standard value, high-pressure fuel moves the diaphragm upward, opening the ball valve and allowing excess fuel to return through the return line. When the pressure is below the standard value, the spring presses the diaphragm to close the ball valve, stopping the return flow. The function of the pressure regulator is to maintain a constant pressure in the fuel lines.
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