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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCEREMOVE, OVERHAUL & INSTALLENGINE CONTROLS - REMOVAL & INSTALLATIONFUEL SYSTEMSFUEL RAIL ASSEMBLYREMOVAL (5.3L)
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal (5.3L)

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal (5.3L)
  1. Remove the air cleaner outlet duct. See AIR CLEANER RESONATOR OUTLET DUCT .
    NOTE: An eight-digit identification number (1) is located on the fuel rail. Refer to this model identification number if servicing or part replacement is required. See Figure.
  2. Relieve the fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE .
  3. Disconnect the air conditioning (A/C) compressor pressure switch electrical connector (2). See Figure.
  4. Remove the wire harness from the clip (1) on the cylinder head.
  5. Disconnect the Mass Air Flow/Intake Air Temperature (MAF/IAT) sensor electrical connector (1). See Figure.
  6. Disconnect the generator electrical connector.
  7. Disconnect the following electrical connectors on the right hand side of the engine:
    • Coil main electrical harness (1). See Figure.
    • Electronic throttle control (ETC) (2).
    • Fuel injectors (3).
  8. Perform the following steps in order to disconnect the fuel injector electrical connectors.
    • Mark the connectors to their corresponding injectors to ensure correct reassembly.
    • Pull the connector position assurance (CPA) retainer (2) on the connector up 1 click. See Figure.
    • Push the tab (1) on the connector in.
    • Disconnect the fuel injector electrical connector.
    • Repeat the steps for each injector electrical connector.
  9. Remove the electrical harness from the clips on ignition coil bracket.
  10. Disconnect the following electrical connectors on the left hand side of the engine:
    • Evaporative emission (EVAP) purge solenoid (1). See Figure.
    • Knock sensor (2).
    • Manifold absolute pressure (MAP) sensor (3).
    • Main coil (5).
    • Fuel injectors (4).
  11. Remove the electrical harness from the clips on ignition coil bracket.
  12. Remove the positive crankcase ventilation (PCV) hose (with valve). See Figure.
  13. Remove the upper engine wire harness retainer nut (1). See Figure.
  14. Reposition the upper engine wire harness aside.
  15. Disconnect the fuel feed and return pipes (1) from the fuel rail. See Figure. See FUEL LINE DISCONNECT FITTINGS (5.3L) .
  16. Disconnect the fuel pressure regulator vacuum line.
  17. Remove the fuel rail 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.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.