Suzuki GA413, Service Manual

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6E-42 ENGINE AND EMISSION CONTROL SYSTEM
TABLE B-3 FUEL PRESSURE CHECK
SYSTEM DIAGRAM
1. Fuel pump
2. Fuel filter
3. Fuel feed line
4. Fuel pressure regulator
5. Vacuum passage for fuel pressure regulator
6. Fuel return line
SYSTEM DESCRIPTION
Fuel pressure regulator keeps the fuel pressure applied to injector 290kPa 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 11V. If battery voltage
is low, pressure becomes lower than specification even if fuel pump and line are in good condition.
STEP ACTION YES NO
1 Did you perform “ENGINE DIAGNOSTIC FLOW
TABLE” in Section 6?
Go to Step 2. Go to “ENGINE DIAG-
NOSTIC FLOW TABLE”.
2 1) Install fuel pressure gauge. Refer to “Fuel Pres-
sure Inspection” in this section.
2) Turn ignition switch ON position, leaving engine
OFF. After 3 seconds turn ignition switch OFF
position. Repeat this 3 or 4 times and observe
fuel pressure with fuel pump running.
Is fuel pressure indicated within 270 – 310 kPa
(2.7 – 3.1 kg / cm
2
, 38.4 – 44.0 psi)?
Go to Step 3. Go to Step 6.
3 1) Turn ignition switch OFF position.
2) Observe fuel pressure gauge for one minute
after fuel pump stops.
Does fuel pressure hold at or above 200 kPa (2.0
kg / cm
2
, 28.4 psi)?
Go to Step 4. Fuel leaks from injector,
fuel pressure regulator
or fuel pump.
4 1) Start engine to normal operating temperature.
2) Keep it running at specified idle speed.
Is fuel pressure indicated within 210 – 260 kPa
(2.1 – 2.6 kg / cm
2
, 29.8 – 37.0 psi)?
Go to Step 5. Faulty vacuum passage
from intake manifold to
fuel pressure regulator.
Faulty fuel pressure reg-
ulator.