TM 5-5420-226 -20-1
Symptom-7
DETAILED
TROUBLESHOOTING
PROCEDURE
FROM
STEP
VEHICLE
OPERATION
- POWERPLANT,
STARTING
Q40
(Continued)
1
1Check for free fuel flow from main fuel return
outlet at injector pump.
First
Technician
(Rear
Gri]}e Doors)
l Connect
main
fuel return
line quick
disconnect.
Both
Technicians
(Top
Deck)
l Remove engine cooling fans (page 9-55).
l Disconnect
main
fuel return
line at injector
pump,
Second
Technician
(Operator’s
Station)
l Operate
primer
pump.
Does
fuel flow freely from injector pump return
I
outlet?
r l Clear clogged fuel SUPPlY
line between front of engine
and inlet side of fuel injector
pump by blowing with
compressed air. If this does
not work, replace line
(page 7-29).
l Tighten connection in main
fuel return line at top of
engine.
oNO
Clear clogged fuel return line
between injector pump and the
rear of engine by blowing with
compressed air. If this does not
work, replace line.
_
MAIN FUEL
RETURN
LINE
7X
~’
FUEL
INJECTOR
k
PUMP
—
TA106899
4-210
