Line Pressure Inspection

Fuel Line Pressure Inspection

Warning: Fuel line spills and leaks are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedures".

1. Disconnect the negative battery cable.




2. Connect a fuel pressure gauge between the fuel filter (high-pressure side) and fuel distributor.
3. Connect the negative battery cable.




4. Connect the data link connector terminals F/P and GND by using a jumper wire.
5. Turn the ignition switch to ON and measure the fuel line pressure.

Specification: 270-330 kPa (2.7-3.4 kg/cm2, 39-48 psi)

6. Turn off the ignition switch and disconnect the jumper wire.
7. If the pressure is higher than specified, check the fuel pump maximum pressure.
If normal, check the pressure regulator or fuel return hose is clogged.




8. If the pressure is lower than specified, measure the fuel line pressure while pinching the return hose.
- If the fuel line pressure quickly increases, check the pressure regulator.
- If the fuel line pressure gradually increases, check the fuel pump maximum pressure.
If the pressure is normal, check the clogging between fuel pump and pressure regulator.