Download 2008 Chevrolet TrailBlazer Fuel Level Sensor Removal & Installation – Removal Procedure 1. Remove the fuel sender assembly. Refer to Fuel Sender Assembly Replacement. 2. Disconnect the fuel pump electrical connector. 3. Remove the retaining clip from the fuel level sensor connector. 4. Disconnect the electrical connector from under the fuel sender cover. 5. Remove the sensor retaining clip. 6. Squeeze the locking tangs and remove the fuel level sensor (3). Installation Procedure 1. Install the fuel level sensor (3). 2. Install the sensor retaining clip. 3. Connect the electrical connector to the fuel level sensor. 4. Install the retaining clip to the fuel level sensor electrical connector. 5. Connect the fuel pump electrical connector. 6. Install the fuel sender assembly. Refer to Fuel Sender Assembly Replacement. FUEL SENDER ASSEMBLY REPLACEMENT Tools Required J 45722 Fuel Tank Sending Unit Wrench. See Special Tools. Removal Procedure 1. Remove the fuel tank. Refer to Fuel Tank Replacement (TrailBlazer EXT, Envoy XL, Envoy XUV) or Fuel Tank Replacement (TrailBlazer, Envoy, Rainier). 2. Use the J 45722 and a long breaker-bar in order to unlock the fuel sender lock ring. See Special Tools. Turn the fuel sender lock ring in a counterclockwise direction. 3. Remove the fuel sender assembly (2) and the seal (3). Discard the seal. 4. Clean the fuel sender sealing surfaces (4). 5. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gage at 7 points. 6. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.