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 TM 9-2815-220-24
ENGINE FAILS TO START AT NORMAL CRANKING SPEED
0008 00
MALFUNCTION 1: (Continued)
Cylinders not firing (insufficient fuel or incomplete combustion).
PROCEDURE
OBSERVATION
ANALYSIS
Solenoid Valve(s) Operation
NOTE
Disconnect purge pump fuel hose quick-disconnect coupling at engine
before performing test.
Note audible "click" or opening
Press heater switch
Evidence of action indicates
and closing valve action (by touch)
intermittently "ON"
normal solenoid valve
of both solenoid valves (fuel
and "OFF".
operation.
supply and fuel return).
No audible "click" or action
indicates solenoid valve(s) is
defective.
Fuel System Checks
Note fuel with each firm stroke of
Purge Pump:
Moderate flow with each
purge pump.
Disconnect purge
stroke indicates normal purge
pump fuel hose quick
pump operation.
disconnect coupling at
engine main fuel
If flow is not evident, purge
backflow valve. Hold
pump is defective, or purge
coupling valve open
lines are blocked or leaking.
and operate purge
pump.
Note fuel flow with each stroke of
Fuel Filter:
Moderate flow with each
purge pump.
Disconnect fuel tube
stroke indicates no in-line filter
between fuel check
restriction. Filter satisfactory.
valve tee and manifold
No flow, or restricted flow,
heater fuel filter and
indicates in-line filter is
operate purge pump.
plugged.
With switch in "ON" position, note
Solenoid Valve and
Fuel flow indicates solenoid
fuel flow from tee opening with
Fuel Filter:
valve is operating properly and
each purge pump stroke.
Disconnect one fuel
fuel filters are satisfactory.
tube from engine front
No fuel or restricted flow
solenoid valve outlet
indicates manifold heater filter
tree, operate purge
or felt filters in solenoid valve
pump and press heater
are restricted or clogged.
switch "ON" and
"OFF".
WP 0008 00-3
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