TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 905 of 1313
FUEL GAUGE INOPERATIVE - Continued
STEP
1.
IS FUEL LEVEL SENDING UNIT OPERATIONAL?
a.
Place battery switch in the OFF position.
b.
Refer to point to point schematics.
T0089DAA
Figure 1.
Fuel Level Sending Unit.
NOTE
Make sure fuel selector switch is set to sending unit side being tested.
c.
Remove circuit wire from inoperative fuel sending unit (wire 28 for left hand tank, wire 29 for right hand
tank).
d.
Place battery switch to ON position.
e.
Have assistant momentarily ground disconnected circuit 28 or 29 wire.
NOTE
If fuel gauge deflects when circuit 28 or 29 wire is grounded, fuel sending unit is faulty.
f.
Observe fuel gauge for movement.
TM 9-2320-272-23-1
0107
0107-2
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