Mitsubishi Eclipse Workshop Manual page 172

13-104
FUEL
-
On-vehicle Inspection
of
MPI Components
Symptom Probable cause
Remedy
o
Fuel pressure too
low
.
Fuel pressure
drops after racing
o No fuel
pressure
in
fuel
return
hose
Clogged fuel filter
Replace
fuel filter
Fuel leaking
to
return side due
to poor
fuel regulator
valve seating
or
settled
spnng
Beplace
fuel pressure regulator
Low
fuel pump deliwry
pressure
Replace
fuel pump
Fuel pressure
too
high Binding
rnlre
in
fuel pressure
regulator
Replace fuel
pressure regulator
Clogged
fuel return hose or pipe
Clean
or
replace
hose
or pipe
Same
fuel pressure
wtren vacuum
hose is connected and when
disconnected
Damaged
vacuum hose or clogged
nipple
Replace vacuum hose
or
clean
nipple
(15)
lf any of fuel pressure measured in steps
(1 1)
to (14)
is out
of
specification, troubleshoot and repair according
to
the
table
below
o
(17)Release residual pressure from the fuel pipe line.
(Refer
to
P.13-102.)
(18)Remove the fuel pressure gauge and special
tool from the
delivery pipe.
C!utktn
Coror
üe
hose connoction
wiüt
rags
to prewnt sphdl
of
fud
that could
be caused by some rcrftlual piscsur€
in üre frtel pipe
llne.
(l9lReplace
the O-ring at the end of the fuel high
pressure
hose
with a
new one.
(20)Fit the fuel high pressure hose over the delivery pipe
and
tighten the bolt to
specified torque.
fightoning tolque:
5
Nm (O.5 kgm, 3.6 ft.lbs.l
Pl)Check for fuel
leaks.
@
Apply
the
battery voltage
to
the fuel pump
drive
terminal
to
drive the fuel pump.
@ Under
fuel
pressure, check the
fuel
line
for
leaks.
C
e
(16lStop the engine and check change of fuel pressure gauge
_
reading. Normal
if
the
reading does
not drop within
2l
minutes.
lf it
does, observe the rate of drop and
trouble-v
shoot and repair according to the table
below.
e
o
,
'Ä
Symptom Probable cause
Remedy
Fuel pressure drops gradually after
engine is stopped
Leaky
injector
Replace injector
Leaky
fuel regulator
valve seat
Replace
fuel pressure regulator
Fuel pressure
drops sharply
immediately after engine
is
stopped
Check vahre
in fuel pump is held
open Replace fuel pump