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 2 . ( C o n t ).
b. If VTM display does not indicate 20 to 30 psi, go to step 3 be-
low.
S t e p 3 . R e p l a c e f u e l f i l t e r s ( p a g e 4 - 3 8 ) .
Bleed air from fuel system (page 4-40).
Tell assistant to crank engine for 30 seconds while you watch VTM
d i s p l a y.
Display should indicate 20 to 30 psi.
a. If VTM display indicates 20 to 30 psi, troubleshooting is com-
plete. Problem was in fuel filters. Disconnect test equipment
and reinstall plug in elbow.
b. If pressure gage does not indicate 20 to 30 psi, go to step 4
below.
Step 4. Loosen fitting and disconnect filter hose from fitting.
Disconnect opposite end of
f i l t e r h o s e f r o m f i l t e r h e a d.
Check filter hose for obstruc-
t i o n.
Compressed air used for cleaning
p u r p o s e s w i l l n o t e x c e e d 3 0 p s i.
U s e 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 n t
( 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 u s 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
y o u h u r t y o u r e y e s o r i f a f o r -
e i g n o b j e c t i s b l o w n i n t o y o u r
e y e s , s e e k m e d i c a l a t t e n t i o n i m-
m e d i a t e l y.
a .
b .
If filter hose is obstructed, clear obstruction using compressed
a i r .
If filter hose is not obstructed, disconnect transducer cable W4
from pressure transducer. Remove pressure transducer and adapter
from elbow, reinstall plug, and replace filter head (page 4-41).
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