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Page Title:
Engine runs hot, misfires, or runs rough |
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 53. TROUBLESHOOTING FUEL SYSTEM - Continued
Probable causes
Corrective action
Malfunction
Troubleshoot intake mani-
2.
Fuel being delivered
--.
b
Defective intake mani-
--.
b
fold flame heater fuel
fold flame heater, igni-
at nozzles but engine
will not run, start,
system.
tion unit, spark plug,
heater fuel pump, and
or runs rough on one
filters for malfunctioning
or more cylinders -
as directed in trouble-
Continued.
shooting intake manifold
flame heater fuel system
Replace primary and final
--.
c
--.
c
Partially plugged fuel
fuel filters (par. 72). Re-
filters or fuel is con-
fer to TM 9-2320-235-20
taminated.
and drain vehicle fuel
tank of water or contam-
inants.
Remove fuel injection
--.
d
--.
d
Defective fuel injection
pump (par. 63b). Rebuild
pump.
fuel injection pump as
directed in TM 9-2910-
223-35. Replace pump
when necessary. Install
fuel injection pump (par.
Check fuel return valve
e.
--.
e
Leaking fuel return check
as directed in TM 9-
valve on fuel injection
2910-233-35. Replace
pump.
fuel injection pump (par.
a.
Replace primary and
-a.
Insufficient fuel pressure
Engine runs hot,
3.
-
final fuel filters (par. 72).
from supply pump (lean
misfires, or runs
Remove fuel injection
mixture).
rough.
pump (par. 63b). Refer
to TM 9-2910-223-35 for
instructions on fuel sup-
ply pump injection pump
(par. 63c).
--.
b
Refer to TM 9-2910-
Improperly adjusted fuel
b.
223-35 and adjust fuel
injection pump causing
injection pump.
decreased fuel delivery.
c.
Repair or replace fuel
Leaking fuel injection
--.
c
injection tube (par. 100).
tube to nozzle and holder
assembly.
51
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