Escort L4-116 1.9L SOHC HO (1989)
Fuel Gauge Sender: Component Tests and General Diagnostics
Magnetic Type
The required test equipment consists of a Rotunda Gauge Tester part No. 021-00055 or equivalent, a pair of 10 ohm and 75 ohm resistor or another
fuel sender of known quality.
1.
Perform test with resistors as follows:
a. Disconnect wiring connector at sender unit, then connect resistor between gauge lead and a suitable ground.
b. Turn ignition switch to On position.
c. With 10 ohm resitor, the gauge pointer should contact the Full mark.
d. With 75 ohm resistor, the gauge pointer should contact the Empty mark.
2.
Perform test with fuel sender of known quality as follows:
a. Turn ignition switch to Off position.
b. Disconnect wiring connector from sender and connect it to test sender.
c. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The
gauge should read on or above the Full mark.
d. Move float rod toward fuel filter against Empty stop position. Turn ignition switch to Off position. Wait approximately 30 seconds, then turn
ignition switch to On position. The gauge should read on or below the Empty mark.
e. If gauge performs as indicated, perform fuel sender unit tests. Refer to DIAGNOSTIC CHARTS for fuel sender unit tests.
f.
If gauge is out of calibration at the Empty mark, or both the Empty and Full mark, replace gauge.
Bimetal Type
The required test equipment consists of a Rotunda Gauge Tester part No. 021-00055 or equivalent, a pair of 22 ohm and 145 ohm resistor or another
fuel sender of known quality.
1.
Perform test with resistors as follows:
a. Disconnect wiring connector at sender unit, then connect resistor between gauge lead and a suitable ground.
b. Turn ignition switch to On position.
c. With 145 ohm resitor, the gauge pointer should contact the Full mark.
d. With 22 ohm resistor, the gauge pointer should contact the Empty mark.
2.
Perform test with fuel sender of known quality as follows:
a. Turn ignition switch to Off position.
b. Disconnect wiring connector from sender and connect it to test sender.
c. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The
gauge should read on or above the Full mark.
d. Move float rod toward fuel filter against Empty stop position. Turn ignition switch to Off position. Wait approximately 30 seconds, then turn
ignition switch to On position. The gauge should read on or below the Empty mark.
e. If gauge performs as indicated, perform fuel sender unit tests. Refer to DIAGNOSTIC CHARTS for fuel sender unit tests.
f.
If gauge is out of calibration at the Empty mark, or both the Empty and Full mark, replace gauge.
