Suzuki SY413 Service Manual page 2818

TABLE B-3 FUEL PRESSURE CHECK (Page 1 of 2)
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 the following table, check to make sure that battery voltage is higher than 11 V. If battery volt-
age is low, pressure becomes lower than specification even if fuel pump and line are in good condition.
STEP
1 Check Fuel Pressure (Refer to section 6E2 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.
Is fuel pressure then 270 – 310 kPa (2.7 – 3.1 kg / cm
38.4 – 44.0 psi)?
2 Is 200 kPa (2.0 kg / cm
retained for 1 minute after fuel pump is stopped at Step 1?
3 Check Fuel Pressure Regulator for Operation.
1) Start engine and warm it up to normal operating
temperature.
2) Keep it running at specified idle speed.
Is fuel pressure then within 220 – 260 kPa (2.2 – 2.6
2
kg / cm , 31.3 – 36.9 psi)?
4 Is there fuel leakage from fuel feed line hose, pipe or their
joint?
5 Was fuel pressure higher than spec. in Step 1?
6 1) Disconnect fuel return hose from fuel pressure
regulator and connect new return 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?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC) 6-2-101
ACTION
2
, 28.4 psi) or higher fuel pressure
YES
Go to Step 2.
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.
1. Injector
2. Delivery pipe
3. Fuel pressure regulator
4. Fuel filter and 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.
Go to Step 7.
Faulty fuel pressure
regulator.