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 344 of 1313
POOR ACCELERATION AND/OR LACK OF POWER - Continued
T0881DAA
Figure 2.
Fuel System.
b.
Visually inspect AFC standard pump filter for dirty or clogged condition.
NOTE
Perform this step for M936A1 and M928 models.
c.
Visually inspect fuel pump with VC governor filter for dirty or clogged condition.
d.
Visually check primary fuel filter for leaks or damage.
e.
Check fuel lines and connections for leaks, obstructions, and damage.
f.
Tighten all connections where a leak is detected.
CONDITION/INDICATION
IS FUEL SYSTEM IN GOOD OPERATING CONDITION?
DECISION
YES - Go to Step (3).
NO - Fuel filter is leaking or damaged. Replace fuel filter (Volume 2, WP
0258). Go to Step (14) to verify problem
is solved.
NO - Fuel lines are bad. Replace tubing (Volume 2, WP
0254). Go to Step (14) to verify problem is solved.
NO - AFC standard pump filter is bad. Replace AFC standard pump filter (Volume 2, WP
0259). Go to Step (14)
to verify problem is solved.
NO - VC governor fuel filter is bad (M936A1 and M928 models only). Replace VC governor fuel
filter (Volume 2, WP
0260). Go to Step (14) to verify problem is solved.
TM 9-2320-272-23-1
0014
0014-3
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