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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 971 (ENGINE CONTROLS - 8.1L (INTRODUCTION))DESCRIPTION AND OPERATIONFUEL SYSTEM DESCRIPTIONFUEL SENDER ASSEMBLY
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Fuel Sender Assembly

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Fuel Sender Assembly
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.
Fig 1: Identifying Fuel Sender Assembly
GM1244325Courtesy of GENERAL MOTORS CORP.

The fuel sender assembly on single tank applications consists of the following major components:

  • The fuel level sensor
  • The fuel tank pressure (FTP) sensor
  • The fuel tank fuel pump module
  • The fuel strainer
  • The fuel filter
Fig 2: Identifying Fuel Sender Assembly
GM1244325Courtesy of GENERAL MOTORS CORP.

The front fuel sender on dual tank applications consists of the following major components:

  • The fuel level sensor
  • The fuel tank fuel pump module
  • The fuel strainer
  • The fuel filter
Fig 3: Secondary Fuel Sender On Dual Tank Applications
GM645600Courtesy of GENERAL MOTORS CORP.

The secondary fuel sender on dual tank applications consists of the following major components:

  • The fuel level sensor (4)
  • The FTP sensor (1)
  • The rear fuel pump (2)
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.