.
. .
TM 5-5420-226-20-1
Symptom-2
DETAILED
TROUBLESHOOTING
PROCEDURE
VEHICLE
OPERATION
- POWERPLANT,
STARTING
T
(Continued)
First
Technician
(Rear
of Crew
Compartment)
l Connect
main
fuel line from
primary
fuel filter
to
backflow
valve.
l Disconnect
main
fuel line at outlet
side of backflow
valve,
l Place a container
or rags under
the open
fuel line to
catch
any fuel.
Second
Technician
(Operators
Station)
l Set MASTER
BATTERY
switch
ON.
l Set FUEL
PUMPS
switch
ON
for approximately
10
seconds
then
set FUEL
PUMPS
switch
OFF.
l Set MASTER
BATTERY
switch
OFF.
First
Technician
(Rear
of Crew
Compartment)
l Check for free fuel flow from backflow
valve.
BACKFLO~
VALVE
OUTLET
Did fuel flow freely
from outlet
side of the
backflow
valve?
Replace
backflow
valve
(page
7-25).
TA106822
4-133