Mazda CX-9 Grand Touring. Manual — part 416



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

Fig. 23: Identifying Fuel Pump Unit & Plug (2WD)
Courtesy of MAZDA MOTORS CORP.

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 SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION [MZI-

3.7].)

Fig. 24: Identifying Fuel Pump Unit & Plug (4WD)
Courtesy of MAZDA MOTORS CORP.

NONRETURN VALVE INSPECTION [MZI-3.7]

WARNING:



Fuel is very flammable liquid. If fuel spills or leaks from the
pressurized fuel system, it will cause serious injury or death and

2008 Mazda CX-9 Grand Touring

2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:00:01 AM

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© 2005 Mitchell Repair Information Company, LLC.

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel

from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION [MZI-3.7].)

2. Disconnect the negative battery cable.

3. Remove the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7].)

4. Siphon the fuel from the fuel tank.

5. Verify that the nonreturn valve is closed.



If malfunction, replace the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION [MZI-
3.7].)

6. Verify that the nonreturn valve is not stuck open and does not open even when pulled up by a finger.



If malfunction, replace the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION [MZI-
3.7].)

Fig. 25: Identifying Nonreturn Valve
Courtesy of MAZDA MOTORS CORP.

FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7]

facility breakage. Fuel can also irritate skin and eyes. To prevent
this, always complete the "Fuel Line Safety Procedure", while
referring to the "BEFORE SERVICE PRECAUTION".

NOTE:



Nonreturn valve is integrated in the fuel tank.



The nonreturn valve is normally closed by the spring force.



Verify the nonreturn valve operation using a mirror.

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, always complete the "Fuel Line Safety
Procedure".



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, before performing the fuel pump unit

2008 Mazda CX-9 Grand Touring

2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:00:01 AM

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© 2005 Mitchell Repair Information Company, LLC.

1. Level the vehicle.

2. Complete the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION [MZI-

3.7].)

3. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)

4. Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7] .)

5. Remove the fuel line schrader valve cap.

6. Connect a long hose to the disconnected schrader valve cap and drain the fuel into a container used for

collecting gasoline.

7. Start the fuel pump using the following procedure.

Fig. 26: Identifying Schrader Valve Cap & Fuel Distributor
Courtesy of MAZDA MOTORS CORP.

removal/installation, always complete the "Fuel Leak Inspection
After Fuel Pump Unit Installation".



A person charged with static electricity could cause a fire or
explosion, resulting in death or serious injury. Before draining fuel,
make sure to discharge static electricity by touching the vehicle
body.

CAUTION:



Because the fuel tank is constructed such that the fuel level is higher
than the installation surface of the fuel pump, fuel leakage could
occur. If the fuel gauge indicates a fuel level of 3/4 or more, perform
the following Steps 3 - 8 to drain 10-15 L {2.7-3.9 US gal, 2.2-3.2 Imp
gal} of fuel.



Disconnecting/connecting the quick release connector without
cleaning it may possibly cause damage to the fuel pipe and quick
release connector. Always clean the quick release connector joint
area before disconnecting/connecting using a cloth or soft brush,
and make sure that it is free of foreign material.

2008 Mazda CX-9 Grand Touring

2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:00:01 AM

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© 2005 Mitchell Repair Information Company, LLC.

Using M-MDS

1. Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)

2. Connect the M-MDS to the DLC-2.

3. Using the simulation function "FP", start the fuel pump.

Fig. 27: Connecting M-MDS To DLC-2
Courtesy of MAZDA MOTORS CORP.

Without using M-MDS

1. Remove the fuel pump relay.

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

3. Connect the negative battery cable and operate the fuel pump.

CAUTION:



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

CAUTION:



The fuel pump could be damaged if it is operated (fuel
pump idling) while there is no fuel in the fuel tank. Verify
the amount of fuel being discharged from the hose and
stop operation of the fuel pump when essentially no fuel is
being discharged.

2008 Mazda CX-9 Grand Touring

2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:00:01 AM

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© 2005 Mitchell Repair Information Company, LLC.