TM 5-3805-262-20
3-5. FUEL SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. LOW FUEL PRESSURE (Cont).
Step 2.
(Cont).
Using compressed air,
clear any blockage from
t u b e .
Reconnect tube fittings to
elbows and tighten
s e c u r e l y .
Remove plug from elbow
i n s t a l l e d i n f u e l i n j e c -
tion pump.
Connect a zero to 50 psi
pressure gage to elbow
port from which plug was
removed (port is 1/8
NPTF).
Bleed air from fuel system
(page 4-40).
Tell assistant to crank engine for 30 seconds while you watch pres-
sure gage.
Pressure gage should indicate 20 to 30 psi.
a. If pressure gage indicates 20 to 30 psi, troubleshooting is com-
p l e t e . Problem was in
a n d f i l t e r h e a d .
b. If pressure gage does
below.
tube between fuel injection pump feed pump
not indicate 20 to 30 psi, go to step 3
Step 3.
Replace fuel filters (page 4-38).
Bleed air from fuel system (page 4-40).
Tell assistant to crank engine for 30 seconds while you watch pres-
sure gage.
Pressure gage should indicate 20 to 30 psi.
a. If pressure gage indicates 20 to 30 psi, troubleshooting is com-
plete. Problem was in fuel filters.
b. If pressure gage does not indicate 20 to 30 psi, go to step 4
below.
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