Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1913 (ENGINE CONTROLS AND FUEL - 3.6L (LCS) - INTRODUCTION)REPAIR INSTRUCTIONSFUEL PUMP REPLACEMENTREMOVAL PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Removal Procedure
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal Procedure
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Relieve the low and high side fuel system pressure. Refer to Fuel Pressure Relief (with CH 48027-100) or Fuel Pressure Relief (w/o CH 48027-100) .
- Remove the drive motor generator power inverter module. Refer to Drive Motor Generator Power Inverter Module Removal and Installation .
- Remove the high pressure fuel pump shield. Refer to Fuel Pipe Shield Replacement .
- Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement (LCS) .
- Disconnect the engine wiring harness electrical connector from the high pressure fuel pump.
- Remove the radiator surge tank outlet pipe. Refer to Radiator Surge Tank Outlet Hose/Pipe Replacement (LY7)
- Remove the low pressure feed pipe. Refer to Fuel Feed Pipe Replacement .
- Remove the high pressure pipe. Refer to Fuel Feed Intermediate Pipe Replacement . Discard this pipe.
- Remove and discard the high pressure fuel pump bolts (1).
- Remove the high pressure fuel pump (2).
- Remove and discard the high pressure fuel pump O-ring (3).
- Remove and discard the high pressure fuel pump gasket (4).
- Remove the high pressure fuel pump roller lifter (5).
RENDER: 1.0x
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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.