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Home >> Mazda >> 2007 >> CX-9 V6-3.5L >> Repair and Diagnosis >> Powertrain Management >> Fuel Delivery and Air Induction >> Fuel Tank >> Testing and Inspection
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Fuel Tank: Testing and Inspection

FUEL TANK INSPECTION [MZI-3.5]

NOTE: This inspection is for three rollover valves and fuel shut-off valve integrated in the fuel tank.

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See BEFORE REPAIR PROCEDURE [MZI-3.5].) Before Repair Procedure
2. Disconnect the negative battery cable.
3. To disconnect the fuel pump unit connector, remove the following parts:
1. Second-row seat (LH)
2. Edge cover
3. Long slider cover
4. Rear heat duct No.3
5. Disconnect the fuel pump unit connector.

4. Disconnect the quick release connector and the fuel pump unit connector.
5. Disconnect the joint hose.
6. Disconnect the evaporative hose.
7. Remove the fuel tank with the fuel pump unit.
8. Perform the following procedure to verify the fuel tank airtightness.
1. Plug the fuel pump unit pipe and port B.




2WD




AWD
2. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port A and wait for a while.
3. Verify that there is no air leakage from the fuel tank.
- If there is airflow, replace the fuel tank.

9. Level the fuel tank.
10. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port B and wait for a while.
11. With the pressure still applied, verify that there is airflow from port A and the pressure is 0-3 kPa {0-22 mmHg, 0-0.8 inHg}.
- If malfunction, replace the fuel tank.

12. Apply a pressure of -0.5 kPa {-3.8 mmHg, -0.1 inHg) to port B and wait for a while.
13. With the pressure still applied, verify that there is airflow from port A and the pressure is -0.5-0 kPa {-3.8-0 mmHg, -0.2-0 inHg}.
- If malfunction, replace the fuel tank.
- If there is airflow, place the fuel tank upside down.

14. Apply a pressure of 3 kPa {23 mmHg, 0.9 inHg} to port B and wait for a while.




2WD




AWD

15. With the pressure still applied, verify that there is no airflow from port A.
- If there is airflow, replace the fuel tank.

16. Complete the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [MZI-3.5].) After Repair Procedure
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