Fuel pressure (Honda Civic 5)

Contents: Pressure relief ⇊ Examination ⇊

Pressure relief

Before disconnecting fuel lines or hoses, relieve pressure in the fuel system by loosening the service bolt on the top of the fuel filter.
Do not smoke while working on the fuel system. Keep open flames away from the work area.
Make sure the ignition is off when relieving fuel pressure.

1. Disconnect the cable from the negative battery terminal.

2. Remove the tank cap.

3. Use a spanner to loosen the service bolt on the fuel filter while holding the special bolt with another spanner.

4. Cover the service bolt with a napkin or cloth.

5. Slowly loosen the service bolt one full turn.

5. Slowly loosen the service bolt one full turn.

Note:

A fuel pressure sensor can be screwed into the service bolt hole.

Always replace the sealing washer between the service bolt and the special bolt when loosening the service bolt.

Replace all sealing washers when removing bolts.

Examination

1. Relieve fuel pressure.

2. Unscrew the service bolt from the fuel filter holding the special bolt with a wrench. Attach the special device.

3. Start the engine. Measure the fuel pressure at idle speed, with the vacuum hose removed from the check valve. The end of the hose should be clamped.

The pressure should be:

Engines D14A3, D14A4, D15Z4, D15Z5: 226-275 kPa (2.3-2.8 kg/cm²)
Engines D16Y4, D16Y9: 275-324 kPa (2.7-3.2 kg/cm²)

4. Connect the vacuum hose to the check valve.

The pressure should be:

Engines D14A3, D14A4, D15Z4, D15Z5: 162-211 kPa (1.6-2.15 kg/cm²)
Engines D16Y4, D16Y9: 211-260 kPa (2.0-2.5 kg/cm²)

If the engine does not start, turn on the ignition, wait two seconds, turn off the ignition and turn it on again. Then measure the fuel pressure.

If the fuel pressure is not within normal limits, first check the fuel pump.

If the fuel pump is OK, check the following:

If the pressure is higher than specified: