Hummer H2. Manual - part 1460

1. Turn the ignition ON, with the engine OFF, for 2 seconds.  

2. Turn the ignition OFF for 10 seconds.  

3. Turn the ignition ON, with the engine OFF.  

4. Inspect for fuel leaks.  

FUEL INJECTOR REPLACEMENT 

Removal Procedure 

NOTE:

Use care in removing the fuel injectors in order to prevent damage to the fuel 
injector electrical connector pins or the fuel injector nozzles. Do not immerse 
the fuel injector in any type of cleaner. The fuel injector is an electrical 
component and may be damaged by this cleaning method.

IMPORTANT: The Denso fuel injectors that are installed on the 5.3L (L59) E85 application will 

not have O-rings and retaining clips serviced separately. Therefore the fuel 
injectors will be replaced whenever an O-ring or clip needs to be replaced.

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 123: Expanded View Of Fuel Rails & Injectors 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the fuel rail. Refer to Fuel Rail Assembly Replacement .  

2. Remove the fuel injector retainer clip (19).  

3. Remove the fuel injector (17). 

IMPORTANT: The engine oil may be contaminated with fuel if the fuel injectors are 

leaking.

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 124: Exploded View Of Fuel Injector 
Courtesy of GENERAL MOTORS CORP. 

4. Discard the fuel injector retainer clip (1).  

5. Remove and discard the fuel injector O-ring seals (2, 4) from the injector.  

Installation Procedure 

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 125: Identifying Fuel Injector ID Number 
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: When ordering new fuel injectors, you must order the correct injector for the 

application being serviced.

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Introduction) - 4.8L, 5.3L, and 6.0L - Hummer H2