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6-120 ENGINE GENERAL INFORMATION AND DIAGNOSIS
TABLE B-3 FUEL PRESSURE CHECK
WIRING DIAGRAM
1. Injector
2. Delivery pipe
3. Fuel pump
INSPECTION
Step
1
Check Fuel Pressure (Refer to Section 6E for
details).
1) Release fuel pressure from fuel feed line.
2) Install fuel pressure gauge.
3) Check fuel pressure by repeating ignition
switch ON and OFF. See Fig. 1.
Is fuel pressure then 270 – 310 kPa (2.7 – 3.1
2
kg/cm
, 38.4 – 44.0 psi)?
2
Is 250 kPa (2.5 kg/cm
pressure retained for 1 minute after fuel pump
is stopped at Step 1?
3
Is there fuel leakage from fuel feed line hose,
pipe or their joint?
4
Was fuel pressure higher than spec. in Step 1? Faulty fuel pressure regu-
(A) : Fuel pressure gauge
(B) : Hose
(C) : Attachment
Action
2
, 35.6 psi) or higher fuel
Yes
Go to Step 2.
Normal fuel pressure.
Fuel leakage from hose,
pipe or joint.
lator.
No
Go to Step 4.
Go to Step 3.
Faulty fuel pressure regu-
lator.
Clogged fuel filter,
Restricted fuel feed hose
or pipe, Faulty fuel pump
or Fuel leakage from hose
connection in fuel tank.
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