FUEL LINE TROUBLESHOOTING
For the following symptoms, always follow the steps
in
the troubleshooting flow chart.
- engine slall after warm
up
the engine
- rough idling after warm
up
the engine
- engine lacks power after warm up the engine
FUEL SYSTEM
Before starting the inspection, check for pinched or clogged fuel tank breather hose, fuel hose and fuel feed
hose.
1. Fuel
pump
operation
inspection
Tum
the ignition switch ON and engine stop switch
-OM.
You
should
hear
the
fuel
pump
operation sound for a few seconds.
Is
ther
e
fuel
pump
operation
sound?
YES - GO TO STEP 3.
NO -
GO
TO
STEP 2.
2. Fuel
pump
Input Voltage
inspection
Inspect the
fu
el
pump
input voltage (page 7-13).
Is there
battery
voltage?
YES - Faulty fuel pump.
NO open circuit
in
the Brown wire andl
or
Green wire.
blown
IGN fuse
(lOA
).
faulty fuel
pump
relay (page 4-29) and its circuits.
open circuit
in
the engine stop switch line of the
PCM
/
ECM
(page 4-36).
open circuit in the power/ground
lines
of
Ihe PCM/
ECM
(page 4-35).
3.
Fuel
flow
in
spection
Inspect the fuel flow (page 7-12).
Is the fuel
flow
as
speciffed
?
YES -
GO
TO
STEP
5.
NO -
GO
TO
STEP
4.
4.
Fuel
tank
s
tr
ainer
screen
i
nspect
i
on
Inspect the fuel tank strainer screen for clogged (page 7-21).
Is the fuel tank s train
er
screen
normal
?
YES _ . Replace the fuel
pump
filter with a new one (page 7-14),
and
recheck the fuel flow (page 7-12).
If the fuel flow is less than specified, replace the fuel
pump
(page 7-14).
NO - Clean the strainer screen (page 7-21), and recheck
th
e fuel flow (page 7-12).
5.
Fuel
pressure
inspection
Inspect the fuel pressure (page 7-
11
).
Is the
fuel
pressure
as s
pe
cmed ?
YES
_.
Inspect the ignition system (page 5-5).
• Inspect the cylinder compression (page 10-7).
NO
- Replace the fuel
pump
with a
new
one
(page 7-14
),
and recheck.
7·5
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