Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 127

6-122 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)
Table B-3 Fuel Pressure Inspection
SYSTEM DIAGRAM
(A) : Gauge (C) : Attachment
(B) : Hose 1. Injector
INSPECTION
NOTE:
Before using following flow table, check to make sure that battery voltage is higher than 11 V. If bat-
tery voltage is low, pressure becomes lower than specification even if fuel pump and line are in good
condition.
Step
1 1) Install fuel pressure gauge, referring to
"Fuel Pressure Inspection" in Section 6E1.
2) Operate fuel pump.
Is fuel pressure then 250 – 300 kPa (2.5 – 3.0
2
kg/cm , 35.6 – 42.7 psi)?
2
Is 180 kPa (1.8 kg/cm
pressure retained for 1 minute after fuel pump is
stopped at Step 1?
3 1) Start engine and warm it up to normal oper-
ating temperature.
2) Keep it running at specified idle speed.
Is fuel pressure then within 210 – 260 kPa (2.1
2
– 2.6 kg/cm , 29.8 – 37.0 psi)?
4 Is there fuel leakage from fuel feed line hose,
pipe or joint?
5 Was fuel pressure higher than spec. in Step 1? Go to Step 6.
6 1) Disconnect fuel return hose from fuel pipe
and connect new hose to it.
2) Put the other end of new return hose into
approved gasoline container.
3) Operate fuel pump.
Is specified fuel pressure obtained then?
2. Delivery pipe
3. Fuel pressure regulator
Action
2
, 25.6 psi) or higher fuel
4. Fuel filter
5. Fuel pump
Yes
Go to Step 2.
Go to Step 3.
Normal fuel pressure.
Fuel leakage from hose,
pipe or joint.
Restricted fuel return
hose or pipe.
No
Go to Step 5.
Go to Step 4.
Clogged vacuum passage
for fuel pressure regula-
tor or faulty fuel pressure
regulator.
Go to Step 10.
Go to Step 7.
Faulty fuel pressure regu-
lator.