TM-9-2320-280-20-1
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3
JANUARY 1996
TM-9-2320-280-20-1 - Page 194 of 888
TM 9-2320-280-20-1
REFERENCE INFORMATION
FUEL SYSTEM
1. Connect RED clip to the indicated
test point; BLACK clip to negative or
ground.
2. Start Test 90.
3. Displayed reading is in amps.
WARNING
Diesel fuel is highly flammable. Do not
perform any procedures near fire, flames,
or sparks. Severe injury or death may
result.
1. Disconnect the return line and direct it
into a suitable container.
2. Watch the fuel flow from the return line
as you or an assistant try to start the
engine.
Change 2
2-107
NOTE
When using a multimeter to measure
current through wire 54A, disconnect the
wire. Set the ammeter to a scale of at
least 5 amps DC. Connect the red lead of
the multimeter to wire 54A and the black
lead to ground. With the rotary switch in
the RUN position, measure current. Be
sure to read the correct scale. Return the
switch to the STOP position. Disconnect
the multimeter and reconnect wire 54A.
5 AMPS DC
STE/ICE-R TEST 89
1. Select Fuel Supply Pressure Test
(Test #24). Perform CAL.
2. Crank (or start) engine.
FUEL PUMP PRESSURE
STE/ICE-R TEST #24
1. Disconnect fuel line at injection
pump inlet and route fuel line into a
suitable, 1 quart container.
2. Crank the engine for 30 seconds.
3. If the pump and lines are ok, you
should get about 1 pint (1/2 quart)
(0.5L) in 30 seconds.
FUEL PUMP VOLUME TEST
1. Connect a tee into the fuel line
between the fuel filter outlet and the
injection pump inlet.
2. Attach gauge to tee.
3. Crank (or Start) engine.
FUEL PUMP PRESSURE TEST
PRESSURE GAUGE
!!
GLOWPLUG
CONTROLLER/
TEMP SENSOR
WIRE 54A
FUEL RETURN LINE
FUEL SOLENOID
WIRE 569B/569D
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