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 970 (ENGINE CONTROLS - 4.8L, 5.3L, & 6.0L (INTRODUCTION))REPAIR INSTRUCTIONSFUEL SENDER ASSEMBLY REPLACEMENT (5.3L (L59) ENGINE)REMOVAL 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 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Remove the fuel tank. Refer to Fuel Tank Replacement (Pickup) or Fuel Tank Replacement (Pickup - 5.3L (L59) Engine) or Fuel Tank Replacement (1500 Crew Cab) or Fuel Tank Replacement (Cab/Chassis - Front) or Fuel Tank Replacement (Cab/Chassis - Rear) .
Disconnect fuel lines from the sending unit, if required. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
Using J 44402 , remove the sending unit lock ring.

Fig 1: Removing/Installing Sending Unit Lock Ring (5.3L (L59))

Courtesy of GENERAL MOTORS CORP.

Remove the sending unit and seal. Discard the seal.
CAUTION: Drain the fuel from the fuel sender assembly into an approved container in order to reduce the risk of fire and personal injury. Never store the fuel in an open container.

Fig 2: Fuel Sender Assembly (5.3L (L59))

Courtesy of GENERAL MOTORS CORP.

Clean the sending unit sealing surfaces.

RENDER: 1.0x

NO RELATED

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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.