TM 5-3805-262-20
3-31. FUEL SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. LOW FUEL PRESSURE (Cont).
S t e p 1 . ( C o n t ).
Dial 50 into TEST SELECT.
Press and hold TEST until CAL appears on display then release TEST.
W a i t f o r o f f s e t v a l u e t o a p p e a r o n d i s p l a y . O f f s e t v a l u e s h o u l d be
b e t w e e n - 1 5 0 t o + 1 5 0 . I f i t i s n o t,
STE/ICE is defective (refer to
TM 9-4910-571-12&P).
Bleed air from fuel system (page 4-40).
NOTE
If air cannot be bled from fuel system (fuel does not flow from bleed
valves with ignition key switch on) go to step 5 below.
Press and release TEST.
Pull fuel SHUT OFF control out.
Crank engine for 30 seconds using ignition key switch. Be sure to
return ignition key switch to off position after cranking.
Display should indicate 20 to 30 psi.
a. If VTM display indicates 20 to 30 psi, there is a blockage in
f u e l f i l t e r s , f i l t e r h e a d , o r f i l t e r h o s e c o n n e c t e d b e t w e e n f i l-
ter head and fuel injection pump. Go to step 2 below.
b. If VTM display does not indicate 20 to 30 psi, go to step 5 be-
low.
Step 2.
Loosen clamps and disconnect hose from barb fittings installed in
filter head and fuel injection pump feed pump.
Disconnect transducer cable W4 from pressure transducer.
Remove pressure transducer 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.
Compressed air used for cleaning purposes will not exceed 30 psi. Use
o n l y w i t h e f f e c t i v e c h i p g u a r d i n g a n d p e r s o n a l p r o t e c t i v e e q u i p m e nt
( g o g g l e s / s h i e l d , g l o v e s , e t c ) . F a i l u r e t o d o s o c o u l d c a u s e s e r i o us
i n j u r y t o e y e s a n d p o s s i b l e b l i n d n e s s.
If you hurt your eyes or if a
foreign object is blown into your eyes, seek medical attention immedia-
ately.
Using compressed air, clear any blockage from tube.
Reconnect tube fittings to elbows and tighten securely.
Remove plug from elbow installed in fuel injection pump.
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