Fuel Pressure: Testing and Inspection

FUEL LINE PRESSURE INSPECTION [MZI-3.7]

WARNING:
- Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death. Fuel can also irritate skin and eyes. To prevent this, always complete the "BEFORE REPAIR PROCEDURE".

1. Complete the "BEFORE SERVICE PRECAUTION". Before Service Precaution

2. Disconnect the negative battery cable. Removal and Replacement

3. Remove the engine cover. Service and Repair

4. Remove the air hose. Service and Repair

5. Perform the work using the following procedure.

- Disconnect the quick release connector from the fuel distributor. Quick Release Connector Removal/Installation
- Connect the thin part of SST (49 T013 102) to SST (49 N013 102A) until a click sound is heard.





- Connect the thick end of SST (49 T013 102) to the quick release connector until a click sound is heard.
- Connect SST (49 B019 901B) to SST (49 N013 101A).
- Connect SST (49 N013 101A) to SST (49 N013 102A) until a click sound is heard.
- Turn the SST lever so that it is 90° to the hose as shown in the figure.

6. Verify that the selector is in N or P position.

7. Remove the fuel pump relay.

CAUTION:
- Short the specified terminals because shorting the wrong terminal of the main fuse block may cause malfunctions.

8. Using a jumper wire, short fuel pump relay terminals C and D in the main fuse block.






9. Connect the negative battery cable and operate the fuel pump. Removal and Replacement

10. Measure the fuel line pressure. (during key on engine off (KOEO))

- If not as specified, inspect the following:

Zero or low
- Fuel pump circuit
- Fuel pump
- Fuel line (clogging)
- Fuel leakage inside pressure regulator

High
- Pressure regulator

Fuel line pressure
- 430-510 kPa {4.39-5.20 kgf/cm2, 62.4-73.9 psi}

11. Turn the ignition switch off.

12. Disconnect the negative battery cable to stop the fuel pump.

13. Measure the fuel hold pressure after 5 min.

- If not within the specification, inspect the following:

- Fuel line for clogging or leakage

Fuel hold pressure
- 250 kPa {2.55 kgf/cm2, 36.3 psi}

14. Complete the "BEFORE SERVICE PRECAUTION". Before Service Precaution

15. Disconnect the fuel pressure gauge and connect the fuel pipe.

16. Complete the "AFTER SERVICE PRECAUTION". After Service Precaution