TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 299 of 1417
NG30: ENGINE CRANK - NO START - Continued
STEP
6.
Measure fuel pressure during crank.
NOTE
If display is negative (-), then it is not greater than 2 IN HG.
a.
Turn on fuel and accessory switch.
b.
Press TEST.
c.
Crank engine and watch VTM display.
CONDITION/INDICATION
Is reading greater than 2IN. HG?
DECISION
YES - Go to Step (7).
NO - Replace fuel filter (WP
0258). Repeat Step (4). If pressure is still low, fuel pump is defective.
STEP
7.
Inspect fuel lines.
a.
In freezing temperatures, check for ice in lines or thickening of fuel.
b.
Inspect fuel lines and in tank filters (if any) for kinks, blockage, or damage.
c.
Check fuel tank vent.
d.
Check operation of in tank pump (if any).
e.
Repair as necessary.
f.
Attempt to start engine (TM 9-2320-272-10).
CONDITION/INDICATION
Does engine start?
DECISION
YES - After completing repair, rerun GO-Chain tests to verify the problem is solved and no other problems exist.
NO - Notify supervisor.
END OF WORK PACKAGE
TM 9-2320-272-23-2
0199
0199-4
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