TM 9-2320-387-24-l
FUEL SYSTEM
I
KNOWN INFO
FUEL SOLENOID AND
WIRING OK
POSSIBLE
PROBLEMS
FUEL RETURN LINES
INJECTION PUMP
INJECTORS
RETURN CHECK VALVE
KNOWN INFO
RETURN LINES OK
POSSIBLE
PROBLEMS
INJECTION PUMP
INJECTORS
KNOWN INFO
I
RETURN LINES OK
POSSIBLE
PROBLEMS
1
I
INJECTION PUMP
INJECTORS
DOES THE ENGINE RUN POORLY
WITH THE RETURN LINE
DISCONNECTED?
DIAGNOSTIC FLOWCHART
VISUAL
REASON FOR QUESTION
Plugged fuel return lines cause
back pressure which prevents
injection pump from working
properly.
RUN THE INTAKE/EXHAUST
TESTS.
RETURN HERE IF NO FAULTS
FOUND.
L
AIR INTAKE/EXHAUST
TESTS
(Page 2-141)
intake/exhaust
fault. If you came
here from startability. this wasn’t
t B6
COULD NOT VERIFY IF THERE IS
AN INJECTOR OR INJECTION
PUMP PROBLEM.
NOTIFY DS MAINTENANCE
(CHAPTER 14).
1 OPTIONS
NONE
REASON FOR TESTS
A complete test of the fuel pump
and injectors can’t be done at this
level of maintenance but most fuel
problems that would keep the
engine from starting have been
checked.
2-112
