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 172 of 1205

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