Suzuki 2000 Grand Vitara SQ625 Service Manual page 105

TABLE B-3 FUEL PRESSURE INSPECTION
SYSTEM DIAGRAM
INSPECTION
NOTE:
Before using following flow table, check to make sure that battery voltage is higher than 11 V. If battery
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 kg/cm
2 Is 180 kPa (1.8 kg/cm
fuel pressure retained for 1 minute after
fuel pump is stopped at Step 1?
3 1) Start engine and warm it up to normal
operating temperature.
2) Keep it running at specified idle speed.
Is fuel pressure then within 210 – 260 kPa
(2.1 – 2.6 kg/cm
4 Is there fuel leakage from fuel feed line
hose, pipe or joint?
5 Was fuel pressure higher than spec. in Step 1?
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?
7 Was no fuel pressure applied in Step 1?
ACTION
2
, 35.6 – 42.7 psi)?
2
, 25.6 psi) or higher
2
, 29.8 – 37.0 psi)?
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-101
YES
Go to Step 2.
Go to Step 3.
Normal fuel pressure.
Fuel leakage from
hose, pipe or joint.
Go to Step 6.
Restricted fuel return
hose or pipe.
Go to Step 8 on the
next page.
1. Injector
2. Delivery pipe
3. Fuel pressure
regulator
4. Fuel filter
5. Fuel pump
(A): Gauge
(B): Hose
(C): Attachment
NO
Go to Step 5.
Go to Step 4.
Clogged vacuum
passage for fuel
pressure regulator or
faulty fuel pressure
regulator.
Go to Step 10 on the next
page.
Go to Step 7.
Faulty fuel pressure
regulator.
Go to Step 9 on the next
page.
(Low pressure is
measured.)