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8.5.1 Calibrating The 0 To 100% Fuel Level Sensor
NOTE
Both the Empty and the Full level settings
should be calibrated whenever a new sensor is
installed into a fuel tank.
a. Verify that the wiring is correct. See Figure 8--4 for
correct wiring.
b. To adjust the Empty setting, make certain that the fuel
tank is empty, and that the sensor is dry. If the sensor
has been in the fuel, let it hang to dry for 2 hours be-
fore attempting to calibrate.
c. With the sensor in the tank, dry, and the tank empty,
turn both the Full and Empty Adjustments to the full
clockwise position.
d.Turn all Compartment switches OFF and place SROS
in Start/Run position.
e. Press the Select Key to bring up the Unit Data List.
Scroll through the list until you reach
FUEL LEVEL :___%. Press the = key to lock the fuel
level into the MessageCenter.
f. Slowly turn the Empty screw counter--clockwise until
the display indicates 0%. DO NOT ADJUST ANY
FURTHER.
g. Fill the tank with fuel until full.
h. Slowly turn the Full adjusting screw counter--clock-
wise until the display indicates 100%. DO NOT AD-
JUST ANY FURTHER.
Red Wire (A) to SPK5 +12VDC Input
White Wire (B) to 1MP26 Micro Input
Black Wire (C) to SP24 (Ground)
Figure 8--4. Fuel Level Sensor Wiring
8.5.2 Testing The 0 To 100% Fuel Level Sensor
a. Verify that the wiring to sensor is correct.
b. Check voltage at the Fuel Level Sensor with the
SROS in the Start/Run position.
c. Voltage between Red Wire (positive) and Black Wire
(negative) should be 12.5 to 13.5 VDC. Do not dis-
connect the Red or Black wires from the switch.
d. Disconnect the White Wire (output) from the sensor.
Voltage between Black Wire (negative) and White
Wire (output) should be 0 VDC when the switch is dry
and out of the fuel.
e. When the switch is immersed into fuel, the voltage
reading between Black Wire (negative) and White
Wire (output) increase up to 5 VDC when fuel has
reached the full mark.
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