Mazda CX-9 Grand Touring. Manual — part 412

Fig. 4: Fuel System Diagram
Courtesy of MAZDA MOTORS CORP.

BEFORE SERVICE PRECAUTION [MZI-3.7]

FUEL LINE SAFETY PROCEDURE

1. Remove the fuel-filler cap and release the pressure in the fuel tank.

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

3. Remove the fuel pump relay.

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

WARNING:



Fuel vapor is hazardous. It can easily ignite, causing serious injury
and damage. Always keep sparks and flames away from fuel.



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 following "Fuel Line
Safety Procedure".



A person charged with static electricity could cause a fire or
explosion, resulting in death or serious injury. Before performing
work on the fuel system, discharge static electricity by touching the
vehicle body.

NOTE:



Fuel in the fuel system is under high pressure also when the engine is not
running.

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.

5. Start the engine.

6. After the engine stalls, crank the engine several times.

7. Turn the ignition switch to LOCK position.

8. Install the fuel pump relay.

Fig. 5: Identifying Fuel Pump Relay & Main Fuse Block
Courtesy of MAZDA MOTORS CORP.

AFTER SERVICE PRECAUTION [MZI-3.7]

FUEL LEAKAGE INSPECTION

Using M-MDS

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

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

3. Verify that there is no fuel leakage from the pressurized parts.



If there is leakage, replace the fuel hoses and clips.



If there is damage on the seal on the fuel pipe side, replace the fuel pipe.

WARNING:



Fuel line spills and leakage are dangerous. Fuel can ignite and cause
serious injuries or death and damage. When installing the fuel hose,
observe "Fuel Leakage Inspection" described below.

WARNING:



Fuel line spills and leakage are dangerous. Fuel can ignite and cause
serious injuries or death and damage. Always carry out the following
procedure with the engine stopped.

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

Page 5

© 2005 Mitchell Repair Information Company, LLC.

Fig. 6: Connecting M-MDS To DLC-2
Courtesy of MAZDA MOTORS CORP.

Standard

There shall be no leakage after 5 min.

4. After reinstallation, repeat step 2 - 3 in the fuel leakage inspection.

Without using M-MDS

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

2. Remove the fuel pump relay.

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

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

5. Verify that there is no fuel leakage from the pressurized parts.



If there is leakage, replace the fuel hoses and clips.



If there is damage on the seal on the fuel pipe side, replace the fuel pipe.

Fig. 7: Identifying Main Fuse Block (Fuel Pump Relay)

CAUTION:



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

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

Page 6

© 2005 Mitchell Repair Information Company, LLC.

Courtesy of MAZDA MOTORS CORP.

Standard

There shall be no leakage after 5 min.

6. After repair, assemble the system and repeat Steps 4 - 5.

FUEL LINE PRESSURE INSPECTION [MZI-3.7]

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

3.7].)

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

3. Remove the fuel line schrader valve cap.

Fig. 8: Identifying Schrader Valve Cap & Fuel Distributor
Courtesy of MAZDA MOTORS CORP.

4. Turn the SST lever so that it is 90° to the hose as shown in the figure.

5. Make sure the lever of fuel pressure gauge is turned fully clockwise, then connect the SST to the schrader

valve.

6. Verify that the selector is in N position.

7. Start the fuel pump using the following procedure.

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".

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

Page 7

© 2005 Mitchell Repair Information Company, LLC.