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Removal (4.2L)

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Relieve the fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE .
  2. Remove the intake manifold. See INTAKE MANIFOLD .
  3. Before removal, clean the fuel rail assembly and the cylinder head with a spray type engine cleaner, GM (X-30A). Follow the package instructions. Do not soak the fuel rail in liquid cleaning solvent.
  4. Disconnect the fuel pressure regulator vacuum line. See Figure.
  5. Disconnect the fuel feed and return pipes (1, 2) from the fuel rail. See Figure. See FUEL LINE DISCONNECT FITTINGS (4.2L) .
  6. Disconnect the fuel injector harness in-line connector.
  7. Remove the fuel rail attaching bolts. See Figure.
    NOTE: Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components. 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.
  8. Remove the fuel rail assembly.
  9. Remove the injector lower "O" ring seal (4) from the spray tip end of each injector (3). See Figure.
  10. Discard the "O" ring seals.
  11. If the fuel rail is not being replaced, go to the installation procedure. See INSTALLATION .
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