Hummer H2. Manual - part 1461

1. The fuel injector (1) is stamped with a part number identification (2). A four-digit build date code (3), 

which indicates the month (4), day (5), year (6), and the shift (7) that built the fuel injector. 

Fig. 126: Exploded View Of Fuel Injector 
Courtesy of GENERAL MOTORS CORP. 

2. Lubricate the NEW fuel injector O-ring seals (2, 4) with clean engine oil. 

 

2004 Hummer H2 

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

  

3. Install the NEW fuel injector O-ring seals onto the fuel injector.  

4. Install a NEW retainer clip (1) onto the fuel injector. 

Fig. 127: Expanded View Of Fuel Rails & Injectors 
Courtesy of GENERAL MOTORS CORP. 

5. Install the fuel injector (17) into the fuel rail injector socket with the electrical connector facing outward. 

The retainer clip (19) locks on to a flange on the fuel rail injector socket.  

6. Install the fuel rail. Refer to Fuel Rail Assembly Replacement .  

FUEL INJECTOR CLEANING PROCEDURE 

Tools Required 

 

2004 Hummer H2 

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

  

z

J 37287 Fuel Line Shut-Off Adapters. See Special Tools and Equipment .  

z

J 35800-A Fuel Injector Cleaner  

z

J 42873-1 3/8 Fuel Line Shut-Off Valve  

z

J 42873-2 5/16 Return Pipe Shut-Off Valve  

z

J 42964-1 3/8 Fuel Pipe Shut-Off Valve  

z

J 42964-2 5/16 Fuel Pipe Shut-Off Valve  

NOTE:

z

GM Top-Engine Cleaner is the only injector cleaning agent recommended. 
Do not use other cleaning agents, as they may contain methanol which 
can damage fuel system components.  

z

Under NO circumstances should the top engine cleaner be added to the 
vehicles fuel tank, as it may damage the fuel pump and other system 
components.  

z

Do not exceed a 10 percent cleaning solution concentration. Higher 
concentrations may damage fuel system components. Testing has 
demonstrated that exceeding the 10 percent cleaning solution 
concentration does not improve the effectiveness of this procedure.  

IMPORTANT: Vehicles with less than 160 km (100 mi) on the odometer should not have the 

injectors cleaned. These vehicles should have the injectors replaced.

IMPORTANT: During this procedure you will need a total of 960 ml (32.4 oz) of cleaning 

solution. That is 2 tanks of solution for the J 35800-A . Other brands of tools 
may have a different capacity and would therefore require more or less tanks to 
complete the procedure. You must use all 960 ml (32.4 oz) of solution to ensure 
complete injector cleaning.

 

2004 Hummer H2 

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

  

Fig. 128: Identifying Fuel Injector Cleaner J 38500-A 
Courtesy of GENERAL MOTORS CORP. 

1. Obtain J 35800-A (2). 

IMPORTANT: Make sure the valve at the bottom of the canister (3) is closed.

 

2004 Hummer H2 

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