Calibration Test

NOTE: This calibration test can be performed with a Rotunda instrument gauge system tester (021-00055) or equivalent, a 22 ohm and 145 ohm resistor or another fuel sender of known good quality.



WITH ROTUNDA TESTER or EQUIVALENT


Follow tester instructions to perform calibration test.



WITH RESISTORS


Disconnect the wiring connector at the sender unit, connect a 145 ohm resistor between the gauge lead and a good ground, and turn the ignition switch ON. The gauge pointer should contact the full mark. Replace the 145 ohm resistor with a 22 ohm resistor, the gauge pointer should contact the empty mark.

WITH FUEL SENDER


1. Turn the ignition to the OFF position.
2. Disconnect the wiring connector from the sender and connect it to the test sender.
3. Move the float rod away the fuel filter against the FULL stop position. Wait approximately 30 seconds and turn the ignition to the ON position. The gauge should read on or above the full mark.
4. Move the float rod toward the fuel filter against the empty stop position. Turn the ignition to the OFF position. Wait approximately 30 seconds and turn the ignition to the ON position. The gauge should read on or below the empty mark.
5. If the gauge preforms as indicated.
6. If the gauge is out of calibration at EMPTY mark, or both the EMPTY and FULL mark, replace the gauge.