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 TM 9-2815-220-24
INTAKE MANIFOLD HEATER ABNORMAL OPERATION
0023 00
MALFUNCTION 1: (Continued)
Manifold heater inoperative.
PROCEDURE
OBSERVATION
ANALYSIS
Return Fuel Solenoid Valve
With switch in "ON" position,
Moderate flow indicates
and Check Valve: Remove
note fuel flow from check valve
solenoid valve is operating
fuel return solenoid outlet
opening.
properly and check valve is
tube after the check valve at
opening properly.
rear of engine, operate
No fuel or restricted flow
purge pump and press
indicates check valve stuck
manifold heater switch
closed or filters in solenoid
"ON" and "OFF".
valve are restricted or
clogged. See appropriate
vehicle technical manual.
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).
Replace solenoid.
PROBABLE CAUSE
CORRECTIVE ACTION
Fuel backflow valve
Perform pressure tests in work package
END OF WORK PACKAGE
WP 0023 00-6
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