GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Fuel Injectors

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REMOVAL & INSTALLATION



See Figure 1

When installing fuel injectors, you will need new O-rings.

  1. Before disassembly, clean the fuel rail components with a spray type cleaner such as AC Delco® X-30A, or equivalent. After removal, DO NOT immerse the fuel rail in liquid solvent.
  2.  

Take care when servicing the fuel rail assembly to prevent dirt or contaminants from entering the fuel system. ALL openings in the fuel lines and passages should be capped or plugged while disconnected.

  1. Properly relieve the fuel system pressure and disconnect the negative battery cable.
  2.  
  3. Remove the air intake duct, as necessary for access.
  4.  
  5. Tag and disengage the fuel injector electrical connectors.
  6.  
  7. Disengage the fuel pressure regulator vacuum line, then tag and disengage all other necessary vacuum hoses.
  8.  
  9. Loosen and remove the fuel rail retaining bolts.
  10.  
  11. If necessary to remove the fuel rail assembly completely from the engine compartment, or to prevent stressing and damaging the fuel lines, disconnect the fuel lines from the rail assembly.
  12.  
  13. Carefully lift the fuel rail assembly and fuel injectors from the intake.
  14.  
  15. Carefully release and separate the fuel injectors from the rail assembly.
  16.  
  17. Remove and discard ALL old O-rings from the fuel injectors and, if disconnected, the fuel lines.
  18.  



Click image to see an enlarged view

Fig. Fig. 1: Fuel rail and injectors - 4.3L MFI engine

To install:
  1. Lightly coat the new O-rings with clean engine oil, then position them to the injectors and, if applicable, to the fuel fittings.
  2.  
  3. Install the injectors to the fuel rail assembly.
  4.  
  5. Carefully install the fuel rail and injectors to the intake manifold. Make sure the injectors are properly seated in their bores, but DO NOT force them into position.
  6.  
  7. Install and tighten the rail retaining bolts to 62 inch lbs. (7 Nm).
  8.  
  9. If removed, connect the fuel lines to the rail assembly and secure the fittings.
  10.  
  11. Engage the fuel pressure regulator vacuum line and any other vacuum lines, as noted during removal.
  12.  
  13. Engage the injector electrical connectors.
  14.  
  15. Connect the negative battery cable and cycle the ignition switch (without attempting to start the engine) in order to pressurize the fuel system, then check for leaks.
  16.  
  17. Install the air intake duct.
  18.  

 
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