TM 9-2320-387-24-l
-
DIAGNOSTIC FLOWCHART
FUEL SYSTEM
KNOWN INFO
T OPTIONS
NOTHING
IS THE FUEL SUPPLY AND
QUALITY OK?
POSSIBLE PROBLEMS
VISUAL INSPECTION, SAMPLED
WHILE CRANKING OR RUNNING.
THIS QUESTION ONLY CHECKS
THE SUPPLY OF FUEL IN THE
TANK AND TESTS TO SEE IF IT IS
GRTING
TO THE INJECTOR
PUMP. THIS IS NOT A TEST OF
FUEL PRESSURE.
FUEL LINES
FUEL FILTER
FUEL PUMP
FUEL SOLENOID
INJECTION PUMP
INJECTORS
,ml
REASON FOR OUESTtON
Without a supply of good fuel,
none of the components in the
fuel system can be expected to
work properly.
OPTtONS
TRY STARTlNG ME ENGINE.
KNOWN INFO
FUEL AVAILABLE AND
NOT CONTAMINATED
DOES THE ENGINE START
AND STAY RUNNING?
POSSIBLE PROBLEMS
SOLD ADVANCE
SLOW PLUGS
FUEL LINES
FUEL FILTER
FUEL PUMP
INJECTlON PUMP
FUEL SOLENOID
REl-URN CHECK VALVE
REASON FOR QUESTlON
:I
If it starts, you know that there is
fuel available and the fuel
solenoid is working.
r
ir
KNOWN INFO
1
TRY STARTlNG THE ENGINE
WHILE l-l-S COLD.
FUEL SOLENOID OK
FUEL OK
DOES THE ENGINE START
EASILY WHEN COLD?
]z
I
advance circuit.
POSSIBLE PROBLEMS
COLD ADVANCE
FUEL LINES
FUEL FILTER
FUEL PUMP
INJECTION PUMP
INJECTORS
2-100
