Hummer H2. Manual - part 1457

Fig. 112: View Of Fuel Rail & Injectors 
Courtesy of GENERAL MOTORS CORP. 

18. Remove the fuel rail bolts. 

NOTE:

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Remove the fuel rail assembly carefully in order to prevent damage 
to the injector electrical connector terminals and the injector spray 

 

2004 Hummer H2 

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

  

19. Remove the fuel rail. 

tips. Support the fuel rail after the fuel rail is removed in order to 
avoid damaging the fuel rail components.  

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Cap the fittings and plug the holes when servicing the fuel system in 
order to prevent dirt and other contaminants from entering open 
pipes and passages.  

IMPORTANT: Before removal, clean the fuel rail with a spray type engine cleaner, such 

as GM X-30A or equivalent, if necessary. Follow the package instructions. 
Do not soak the fuel rail in liquid cleaning solvent.

 

2004 Hummer H2 

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

  

Fig. 113: Exploded View Of Fuel Injector 
Courtesy of GENERAL MOTORS CORP. 

20. Remove the fuel injector lower O-ring seal (4) from each injector, if necessary.  

21. Discard the O-ring seal.  

Installation Procedure 

 

2004 Hummer H2 

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

  

Fig. 114: Exploded View Of Fuel Injector 
Courtesy of GENERAL MOTORS CORP. 

1. Lubricate NEW fuel injector lower O-ring seals (4) with clean engine oil.  

2. Install the NEW O-ring seals (4) onto each injector, if necessary. 

 

2004 Hummer H2 

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