TM 9-2320-387-24-l
FUEL SYSTEM
KNOWN INFO
LOW FUEL PUMP
PRESSURE
POSSIBLE
PROBLEMS
FUEL PUMP
FUEL FILTER
FUEL LINES
VENT LINES
FUEL PRESSURE
TRANSDUCER
KNOWN INFO
VENT LINES OK
LOW FUEL PUMP
PRESSURE
POSSIBLE
PROBLEMS
FUEL PUMP
FUEL LINES
FUEL FILTER
FUEL PRESSURE
TRANSDUCER
KNOWN INFO
FUEL FILTER OK
NO WAX BUILD-UP
VENT LINES OK
LOW FUEL PUMP
PRESSURE
FUEL LINES
POSSIBLE
PROBLEMS
FUEL PUMP
FUEL PRESSURE
TRANSDUCER
2-116
LISTEN FOR A HISS WHEN YOU
REMOVE THE FUEL FILLER CAP.
CAN YOU REMOVE THE FILLER
CAP WITHOUT HEARING A HISS?
DIAGNOSTIC FLOWCHART
OPTIONS
VISUAL
REASON FOR QUESTlON
A plugged vent line will
eventually cause enough
negative pressure in the tank to
prevent fuel flow.
r
I
IS THE TEMPERATURE ABOVE
20°F (-7°C) ?
r OPTIONS
VISUAL
REASON FOR QUESTION
When the temperature
is less
than 20°F (-7%). wax flakes
can build up on the fuel tank
strainer or in the fuel filter.
CHECK FOR A
WAX BUILD-UP IN TANK
STRAINER OR FILTER.
USE AN ANTIWAX AGENT
IF AVAILABLE.
BLEED
IF YOU USED THE DCA TO
MEASURE FUEL SUPPLY
PRESSURE, IS THE
STUICE-R, DCA, AND
TRANSDUCER OK?
* OPTIONS
1. DCA TROUBLESHOOTING
(Page 2479)
2. USE A PRESSURE
GAUGE TC
MEASURE FUEL SUPPLY.
REASON FOR QUESTION
Before condemning fuel
pump, make sure that the
pressure transducer is
working.
1,
