Suzuki 2000 Grand Vitara SQ625 Service Manual page 236

TABLE B-3 FUEL PRESSURE CHECK
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
Fuel pressure regulator keeps the fuel pressure applied to injector 290 kPa higher than that in intake manifold at
all times.
INSPECTION
NOTE:
Before using following 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 Fuel Pump Operation check:
(1) Remove fuel filler cap.
(2) Turn ON ignition switch.
Is fuel pump operation sound heard for 3 sec. after
ignition switch ON?
2 Fuel Pressure check (engine stops):
(1) Install fuel filler cap and fuel pressure gauge
referring to "ENGINE AND EMISSION CONTROL"
section.
(2) Operate fuel pump.
Is fuel pressure 270 – 310 kPa?
3 Is 200 kPa or higher fuel pressure retained for 1 minute
after fuel pump is stopped at Step 2?
4 Fuel Pressure check (idling):
(1) Start engine and warm it up to normal operating
temperature.
(2) Keep it running at specified idle speed.
Is fuel pressure 210 – 260 kPa?
ACTION
ENGINE (H25 ENGINE) 6-1-125
YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
Normal fuel pressure.
1. Injector
2. Delivery pipe
3. Fuel pressure
regulator
4. Fuel filter
5. Fuel pump
(A): Gauge
(B): Hose
(C): Attachment
NO
Go to B-1 flow table.
Go to Step 6.
Go to Step 5.
Faulty vacuum
passage for fuel
pressure regulator
or fuel pressure
regulator.