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What is the normal gasoline pressure for a sedan?

1 Answers

OJoseph

07/29/25 8:11pm

Automobile gasoline pressure normally ranges between 300-350kPa. There are two types of automobile fuel systems: the full return system and the semi return system. The difference between them is that the full return system has a return pipeline on the fuel rail, while the semi return system does not. Testing the normal gasoline pressure: Turn on the ignition switch to operate the electric fuel pump. The fuel pressure at this time should meet the technical requirements, generally fluctuating around 0.3MPa. Clamp the return hose, and the reading on the oil pressure gauge at this time is the maximum fuel supply pressure of the fuel pump. This value should comply with the vehicle's technical requirements, generally 2~3 times the working oil pressure, i.e., 0.5~0.75MPa. Release the hose clamp to restore static oil pressure. Remove the fuel pump relay jumper to stop the fuel pump and wait for 5 minutes. The reading on the oil pressure gauge at this time is the holding pressure of the fuel supply system, which should comply with the vehicle's technical specifications, generally reaching around 340KPa. When the engine is idling, the reading on the oil pressure gauge is the idle working pressure of the fuel supply system, generally 0.25MPa or as per the vehicle's technical specifications.

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