FUEL/WATER SEPARATOR OPERATION TESTS
3. Control unit test.
Never touch a sensor probe to the positive terminal of the power
source. Damage to equipment can occur.
A red band identifies top sensor probe (high-level) and it is also the
longer of the two probes. The lower probe is the low-level probe and
is the shorter probe.
a. With power supply connected, lightly press the tip of the low-level probe (15) to the
negative (-) terminal of the 24-volt dc power supply. The voltmeter should register zero
b. Continue holding the low level probe (15) onto the negative (-) terminal and at the same
time press the tip of the high-level probe (14) onto the negative terminal. The voltmeter
should now register 24 volts.
c. Remove the high-level probe (14) only. The meter should continue to register 24 volts for
18 ( 3) seconds and then drop to zero volts.
Meter Negative Lead
Meter Positive Lead
WP 0042 00-7