TM 5-3805-262-20
3-5. FUEL SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. LOW FUEL PRESSURE (Cont).
Step 7. Bleed air from fuel system (page 4-40).
Tell assistant to crank engine for 30 seconds while you watch pres-
sure gage in tee installed in fuel injection pump feed pump port.
Pressure gage should indicate 20 to 30 psi.
a .
b .
If pressure gage indicates 20 to 30 psi, troubleshooting is com-
pleted; problem was in fuel element or fuel bowl.
Loosen clamps and disconnect hose from barb fittings installed
in filter head and fuel injection pump feed pump.
Disconnect pressure gage from tee.
Remove barb hose connectors and tee installed in filter head and
fuel injection pump feed pump.
Reinstall elbows in filter head and fuel injection pump feed
pump.
Using compressed air, clear any blockage from tube.
Reconnect tube fittings to elbows and tighten securely.
Reinstall engine right side panels (page 9-17).
If pressure gage does not indicate 20 to 30 psi, notify next
higher maintenance level to replace fuel injection pump feed
pump.
Step 8. Disconnect opposite end of fuel supply hose at fuel tank and remove
fuel supply hose.
Remove elbow from electric fuel
pump.
Install 1/8 NPTF male to 1/4
NPTF female elbow in electric
fuel pump port.
Install zero to 25 psi pressure
gage in elbow (elbow is 1/4
NPTF) .
T e l l a s s i s t a n t t o t u r n i g n i t i on
key switch to on position.
Pressure gage should indicate
3.2 to 9 psi.
T e l l a s s i s t a n t t o t u r n i g n i t i on
key switch to off position.
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