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 TM 9-2815-220-24
ENGINE ROUGH OPERATION
0014 00
MALFUNCTION 1: (Continued)
Engine misfires (more noticeable at idle operation).
PROBABLE CAUSE
CORRECTIVE ACTION
g. Return fuel line disconnected or restricted.
(1) Inspect fuel line (WP 0088, Manifold
Heater Assembly and Related Parts
Replacement).
h. Manifold heater solenoid defective.
(1) Check solenoid operation as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Note audible "click" or opening
Press heater switch
Evidence of action indicates
and closing valve action (by
intermittently "ON" and
normal solenoid valve
touch) of both solenoid valves
"OFF".
operation.
(fuel supply and fuel return).
No audible "click" or action
indicates solenoid valve(s) is
defective.
To Check Solenoid
With switch in "ON" position,
Fuel flow indicates solenoid
Valve and Fuel Filter:
note fuel flow from tee opening
valve is operating properly and
Disconnect one fuel tube
with each purge pump stroke.
fuel filters are satisfactory.
from engine front
No fuel or restricted flow
solenoid valve outlet tee,
indicates manifold heater filter
operate purge pump and
or felt filters in solenoid valve
press heater switch "ON"
are restricted or clogged.
and "OFF".
With switch in "OFF" position
If fuel flow stops, solenoid
note that fuel flow stops.
valve is closing properly.
If fuel flow continues, solenoid
valve is defective (stuck open).
To Check Return Fuel
With switch in "ON" position,
Moderate flow indicates
Solenoid Valve and
note fuel flow from check valve
solenoid valve is operating
Check Valve: Remove
opening.
properly and check valve is
fuel return solenoid
opening properly.
outlet tube after the
No fuel or restricted flow
check valve at rear of
indicates check valve stuck
engine, operate purge
closed or felt filters in solenoid
pump and press heater
valve are restricted or clogged.
switch "ON" and "OFF".
With switch in "OFF" position,
If fuel flow stops, solenoid
note that fuel flow stops.
valve is closing properly.
If fuel flow continues, solenoid
valve is defective (stuck in open
position).
WP 0014 00-3
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