Mazda CX-9 Grand Touring. Manual - part 402

2WD 

Fig. 2: Identifying Fuel Tank, Nonreturn Valve, Fuel Pump Unit & Quick Release Connector (2WD) 
Courtesy of MAZDA MOTORS CORP. 

AWD 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:04:45 AM

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 3: Identifying Fuel Tank, Nonreturn Valve, Fuel Pump Unit & Quick Release Connector (AWD) 
Courtesy of MAZDA MOTORS CORP. 

FUEL SYSTEM DIAGRAM [MZI-3.7]

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:04:45 AM

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© 2005 Mitchell Repair Information Company, LLC. 

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 10:04:45 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 10:04:45 AM

Page 5 

© 2005 Mitchell Repair Information Company, LLC.