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Home >> Chevrolet >> 1989 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Standard & Electronic >> Testing >> Electronic Instrument Cluster Test >> Fuel Gauge Is Inaccurate (Astro, Safari & "S" Series)

Fuel Gauge Is Inaccurate (Astro, Safari & "S" Series)

  1. Check for shorts or opens in wiring between fuel tank sending unit and cluster, or for an inoperative fuel tank sending unit. To do so, disconnect fuel gauge sending unit at fuel tank. Connect one lead of Instrument Panel Tester (J-33431) to Pink wire and other lead to ground.
  2. Turn ignition switch to "RUN" position and set tester resistance dials to zero (0) ohms. Fuel gauge should read empty. Now set resistance dials to 35 ohms. Fuel gauge should have 7-8 segments lit (half full). Finally, set resistance dials to 90 ohms. Fuel gauge should read full.
  3. If fuel gauge responds correctly, check Black wire to ground at fuel gauge sending unit. If Black wire is okay, replace fuel gauge sending unit. If gauge does not respond as indicated, check Pink wire between fuel gauge sending unit and cluster. If wire is okay, replace inoperative cluster.
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