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Fuel Level Indicator Calibration Test

  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 the gauge and IVR must be tested simultaneously. This test is done on the vehicle.
  2. If test is performed with resistors: Disconnect wiring connector at sender unit, connect the resistor between the gauge lead and a suitable ground. Turn ignition to "ON" position. With the 10 ohm resistor, the gauge should read on or above "FULL". With the 73 ohm resistor, the gauge should read on or below "EMPTY".
  3. If test is performed with a good fuel sender: Disconnect wiring connector from sender and connect it to substitute sender, be sure sender is grounded. Turn ignition to "ON" position, move float rod against full stop position (away from fuel filter). The 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 sender unit. If gauge does not perform as indicated, replace IVR and retest to determine if gauge is causing trouble. If gauge now (with new IVR) reads correctly, problem is solved. If gauge is still out of calibration, gauge is defective and must be replaced.
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