TM 9-2320-387-24-l
FUEL SYSTEM
DIAGNOSTIC FLOWCHART
KNOWN INFO
r OPTIONS
VISUAL
INSPECT THE FUEL LINES.
ARE THE LINES OK?
FUEL FILTER OK
NO WAX BUILD-UP
VENT LINES OK
LOW FUEL PUMP
PRESSURE
POSSIBLE
PROBLEMS
FUEL PUMP
FUEL LINES
FUEL PRESSURE
TRANSDUCER
REASON FOR QUESTION
Kinked fuel lines will
restrict fuel flow.
I
DS
TEST OPTlONS
INSPECT THE FUEL FILTER.
VISUAL
REMOVE THE FILTER ELEMENT
AND CHECK IT FOR DIRT AND
OTHER CONTAMINATION.
KNOWN INFO
NO WAX BUILD-UP
VENT LINES OK
LOW FUEL PUMP
PRESSURE
POSSIBLE
PROBLEMS
IS THE FILTER ELEMENT CLEAN?
REASON FOR QUESTION
FUEL PUMP
FUEL LINES
FUEL FILTER
FUEL PRESSURE
TRANSDUCER
A dirty filter will restrict fuel flow.
I
OPTIONS
VISUAL
KNOWN INFO
FUEL LINES OK
FUEL FILTER OK
NO WAX BUILD-UP
VENT LINES OK
LOW FUEL PUMP
PRESSURE
TRANSDUCEROK
POSSIBLE
PROBLEMS
FUEL PUMP
REMOVE FUEL PUMP.
INSPECT FUEL PUMP PUSHROD
AND CAMSHAFT LOBE.
ARE ALL OF THESE PARTS IN
GOOD CONDITION?
REASON FOR QUESTION
If the components that drive
the fuel pump are worn.
the pump will not operate
properly.
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