TM-9-2320-387-24-1
TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE, VOLUME 1
DECEMBER 1997
CHANGE 1
TM-9-2320-387-24-1 - Page 182 of 1205
TM
9-2320-387-24-l
FUEL SYSTEM
KNOWN INFO
COLD ADVANCE
OK
DIAGNOSTIC FLOWCHART
TEST OPTIONS
ARE THE FUEL SUPPLY LINES
OK?
I
REASON
FOR QUESTION
,
[
Air leaks: lack pf fuel. or
,
restncted cneck valve can cause
rough running at different speeds.
POSSIBLE
PROBLEMS
FUEL LINES
FUEL PUMP
FUEL FILTER
INJECTION
PUMP
INJECTORS
RETURN CHECK VALVE
[
KNOWN INFO
SUPPLY
LINES OK
- OPTIONS
ARE THE FUEL RETURN LINES
OK?
VISUAL
POSSIBLE
PROBLEMS
REASON
FOR QUESTION
FUEL LINES
FUEL PUMP
FUEL FILTER
fNJECTlON
PUMP
INJECTORS
Restricted return lines or
restricted
check
valve can cause
the injection pump to malfunction.
RETURN CHECK VALVE
,#(z&w
KNOWN INFO
=UEL PUMP OK
POSSIBLE
PROBLEMS
INJECTION
PUMP
INJECTORS
A COMPLETE CHECK OF THE
INJECTION PUMP AND
INJECTORS CANNOT BE DONE AT
THIS LEVEL OF MAINTENANCE,
BUT YOU HAVE COVERED MOST
FUEL SYSTEM PROBLEMS THAT
WOULD CAUSE THIS CONDITION.
IF YOU STILL HAVE A PROBLEM,
YOU MAY WANT TO RUN THE
COMPRESSION/MECHANICAL
TESTS BEFORE YOU NOTIFY DS
MAINTENANCE (CHAPTER 14).
COMPRESSlON/MECHANlCAL
TESTS (Page 2-l 47)
TEST OPTIONS
2-122
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