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Fuel Level Indicator Calibration

  1. When instrument voltage regulator or gauge is suspected of being out of calibration, having a fluctuating movement or a high or low reading, both gauge and Instrument Voltage Regulator (IVR) must be tested simultaneously. Perform test on vehicle.
  2. If using resistors, disconnect wiring connector at sender unit. Connect resistor between gauge lead and ground. Turn ignition on. With a 10-ohms resistor (145-ohms resistor with magnetic gauge), gauge should read on or above FULL. With 73-ohms resistor (22.5-ohms resistor with magnetic gauge), gauge should read on or below EMPTY.
  3. If using a known good fuel gauge sending unit, disconnect wiring connector from sender and connect it to substitute sender. Make sure sender is grounded. Turn ignition on, and move float rod against full stop position (away from fuel filter). Gauge should read on or above FULL mark. With float against empty stop, gauge should read on or below EMPTY mark.
  4. If gauge performs as indicated, replace sending unit. If gauge does not perform as indicated, replace IVR and retest to determine if gauge is causing trouble. If gauge now reads correctly, problem is solved. If gauge is still out of calibration, replace fuel gauge.
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