What is the normal fuel pressure for gasoline cars?
1 Answers
Fuel pressure should normally be between 300kpa and 350kpa. The method for testing automotive fuel pressure is as follows: 1. Turn on the ignition switch (without starting the engine) to activate the electric fuel pump. The fuel pressure at this time should meet technical requirements, generally fluctuating around 0.3MPa. 2. Clamp the return fuel hose. The reading on the pressure gauge at this point represents the fuel pump's maximum supply pressure, which should comply with the vehicle's technical specifications. This is typically 2~3 times the working pressure, i.e., 0.5~0.75MPa. 3. Release the hose clamp to restore static fuel pressure. Remove the fuel pump relay jumper to stop the fuel pump operation and wait for 5 minutes. The pressure gauge reading at this time indicates the fuel supply system's holding pressure, which should meet the vehicle's technical specifications, generally reaching around 340KPa.