Quantcast MALFUNCTION 8: Fuel injector nozzle defective.

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TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 7: (Continued)
Engine fuel supply pump defective.
PROCEDURE
OBSERVATION
ANALYSIS
Fuel Pressure Check
Install pressure test gauges:
100 psi gauge in fuel/water separator filter cover bleeder valve
opening (WP 0084, Fuel/Water Separator Automatic Drain
System and Wiring Harness Replacement).
10 psi gauge in primary filter cover bleeder valve opening
(WP 0086, Primary Fuel Filter Repair and Element
Replacement).
Turn master and in-tank fuel
pump switches "ON".
40 psi at fuel/water separator  Primary filter restriction.
Operate engine at high-idle
Element dirty or clogged.
speed (2500-2640 rpm).
filter, and below 1 psi at
primary fuel filter.
PROBABLE CAUSE
CORRECTIVE ACTION
a. (Continued) Fuel pump failure (insufficient  (2) Repair or replace defective fuel pump
fuel output due to defective regulating
assembly (refer to pertinent fuel pump
valve, internal pump wear or shaft seal leak
manual).
causing fuel leakage into engine oil).
(3) Drain oil and replace filters in engine
(WP 0031, Engine Oil Replacement, and
WP 0073, Oil Filters Replacement).
MALFUNCTION 8:
Fuel injector nozzle defective.
PROBABLE CAUSE
CORRECTIVE ACTION
a. Abnormal spray pattern (sticky action, stuck (1) Locate faulty cylinder as follows:
partially open, or orifices partially plugged).
PROCEDURE
OBSERVATION
ANALYSIS
Nozzle Malfunction
Cylinder is not firing due to
Note cylinder on which no
Perform High Pressure Fuel
defective nozzle.
Check on one cylinder at a time  change in engine operation
occurs, or if cylinder misfire
with engine idling (all engine
still exists.
covers removed).
Note if cylinder temperature is  A cold cylinder indicates the
Alternate check with power
cylinder is not firing due to
pack removed. Operate engine  cold (by touch) at intake port
defective nozzle.
area of cylinder head.
at idle speed.
WP 0020 00-9

 


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