Pressure release
- Before disconnecting fuel lines or hoses, relieve pressure in the fuel system by loosening the service bolt on top of the fuel filter.
- Do not smoke while working on the fuel system. Keep open flames away from the workplace.
- Make sure the ignition is turned off while relieving fuel pressure.
1. Disconnect the cable from the negative terminal of the battery.
2. Remove the tank cap.
3. Use a spanner wrench to remove the service bolt on the fuel filter while holding the special bolt with another wrench.
4. Cover the service bolt with a napkin or rag.
5. Slowly unscrew the service bolt one full turn.
Note:
- A fuel pressure sensor can be screwed into the hole in the service bolt.
- 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 while 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 return valve. In this case, the end of the hose must 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 return 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 the ignition on, wait two seconds, turn the ignition off, and turn the ignition on again. After this, 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:
- The return hose or line is kinked or clogged.
- The return valve is faulty.
If the pressure is lower than specified:
- The fuel filter is clogged.
- The return valve is faulty.
- Depressurization of fuel lines.