What is the function of the fuel pump return valve?

1 Answers
KadenDella
07/29/25 9:17pm
The function of the fuel pump return valve is to automatically maintain the fuel pressure in the entire oil pressure system at a certain value, ensuring that the difference between the oil pressure in the fuel supply pipe and the intake manifold pressure remains constant (generally 250-300 kPa). Below is a detailed introduction to the fuel pump return valve: 1. Concept: The fuel pressure regulator, also known as the return valve, is the part of the fuel system responsible for regulating internal fuel pressure, controlled by the system oil pressure and intake manifold pressure (negative pressure). 2. Importance: If the fuel pressure regulator malfunctions, it will directly affect the accuracy of fuel injection. Low fuel pressure can cause low idle speed in the vehicle, a feeling of insufficient fuel supply at high speeds, and in severe cases, difficulty starting or even failure to start. In summer, it may lead to insufficient power for operating the air conditioning. High fuel pressure, on the other hand, can result in high idle speed and overly sensitive accelerator pedal response.
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