What is the normal gasoline pressure?
2 Answers
Normal gasoline pressure typically ranges between 300 to 350 kPa. Excessive gasoline pressure can also increase the pressure on the high-pressure side, causing the fuel injector to not close tightly, leading to fuel dripping and black smoke from the engine. Insufficient gasoline pressure can reduce fuel supply, affecting idle speed and acceleration, decreasing power performance, and even preventing normal engine start-up. Precautions for testing gasoline pressure: 1. Turn on the ignition to operate the electric fuel pump; the fuel pressure at this time should meet technical requirements, fluctuating around 0.3 MPa; 2. The pressure gauge reading during engine idle operation represents the idle working pressure of the fuel supply system, usually 0.25 MPa or as specified by the vehicle's technical standards; 3. When testing idle working pressure, removing the vacuum hose from the fuel pressure regulator should cause the pressure to rise to 0.3 MPa; otherwise, the pressure regulator should be replaced.
The fuel pressure for regular family cars typically ranges between 250 to 350 kPa, depending on the model and year. I usually drive an older Focus, and a gauge reading around 270 is quite normal. If the pressure is too low, cold starts become particularly difficult, and the car may jerk while driving; if it's too high, oil leaks can easily occur. Last time, the mechanic told me that checking the pressure is actually very simple—just plug a pressure gauge into the fuel rail connector to get the reading. What we drivers fear most is breaking down halfway, so it's advisable to have the mechanic check this parameter during regular maintenance. After all, aging fuel pump seals or clogged filters can both affect the pressure.
