Mazda 6 manuals

Mazda 6 Service Manual: Fuel line pressure inspection

Warning

Caution

1. Complete the BEFORE REPAIR PROCEDURE. (See BEFORE REPAIR PROCEDURE)

2. Disconnect the negative battery cable.

Caution

3. Disconnect the quick release connector from the fuel tank as follows:

(1) Push the tab on the locking coupler 90 degrees

until it stops.

(2) Pull the fuel hose straight back.

Note



4. Push the SST

quick release connector into the fuel pipe and plastic fuel hose into the SST

until a click is heard.

5. Turn the lever parallel to the hose of the SST

as shown.


6. Connect the negative battery cable.

7. Verify that the vehicles for AT is at N range and MT is at neutral position.

8. Start the engine and let it idle. Measure the fuel line pressure.

Zero or low

- FP circuit

- FP

- Fuel line (clogged)

- Fuel leakage inside pressure regulator

High

- Pressure regulator for high pressure cause

Fuel line pressure 375-450 kPa {3.9-4.5 kgf/cm2, 55-65 psi}

9. Observe the fuel pressure gauge indicator during heavy acceleration.

10. Verify that the fuel pressure fluctuation is within the specification during the test.

- PCM

- FP

- Pulsation damper

- Fuel line for improper routing, kinks or leakage

Fuel pressure fluctuation 365-450 kPa {3.8-4.5 kgf/cm2, 53-65 psi}

11. Turn the ignition switch to the LOCK position.

12. Measure the fuel hold pressure after 5 min.

- FP hold pressure

- Fuel injector for leakage

- Fuel line for improper routing, kinks or leakage

Fuel hold pressure More than 200 kPa {2.0 kgf/cm2, 29 psi}

13. Complete the BEFORE REPAIR PROCEDURE. (See BEFORE REPAIR PROCEDURE)

14. Disconnect the SST.

Note

15. Inspect the plastic fuel hose and fuel pipe sealing surface for damage and deformation, and replace as necessary.


16. Apply a small amount of clean engine oil to the sealing surface of the fuel pipe.

17. Reconnect the fuel main hose to the fuel distributor until a click is heard.

18. Lightly pull and push the quick release connector a few times by hand and verify that it can move 2.0-3.0 mm {0.08-0.11 in}

and it is connected securely.

19. Complete the AFTER REPAIR PROCEDURE. (See AFTER REPAIR PROCEDURE.)

Nonreturn valve inspection
1. Remove the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.) 2. Siphon the fuel from the fuel tank. Note Nonreturn valve is integrated in the fuel tank. The nonreturn valve is norm ...

Fuel pump unit removal/installation
Warning Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, do not damage the s ...

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