Infiniti I30 (A33). Manual — part 183
13
CHECK ONE-WAY FUEL VALVE-II
1. Make sure that fuel is drained from the tank.
2. Remove fuel filler tube and hose.
3. Check one-way fuel valve for operation as follows.
When a stick is inserted, the valve should open, when removing stick it should close.
SEF665U
Do not drop any material into the tank.
OK or NG
OK
©
INSPECTION END
NG
©
Replace fuel filler tube or replace one-way fuel valve with fuel tank.
SEF372Q
SEF559A
Positive Crankcase Ventilation
DESCRIPTION
NHEC0021
This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to con-
duct crankcase blow-by gas to the intake manifold.
During partial throttle operation of the engine, the intake manifold
sucks the blow-by gas through the PCV valve.
Normally, the capacity of the valve is sufficient to handle any
blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air inlet tubes into the
crankcase. In this process the air passes through the hose con-
necting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to
draw the blow-by flow through the valve. The flow goes through the
hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all
conditions.
SEC137A
INSPECTION
NHEC0022
PCV (Positive Crankcase Ventilation) Valve
NHEC0022S01
With engine running at idle, remove PCV valve ventilation hose
from PCV valve; if the valve is working properly, a hissing noise will
be heard as air passes through it and a strong vacuum should be
felt immediately when a finger is placed over valve inlet.
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
On Board Refueling Vapor Recovery (ORVR) (Cont’d)
EC-47
ET277
PCV Valve Ventilation Hose
NHEC0022S02
1.
Check hoses and hose connections for leaks.
2.
Disconnect all hoses and clean with compressed air. If any
hose cannot be freed of obstructions, replace.
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Positive Crankcase Ventilation (Cont’d)
EC-48
SEF289X
SEF214Y
Fuel Pressure Release
NHEC0023
Before disconnecting fuel line, release fuel pressure from fuel
line to eliminate danger.
WITH CONSULT-II
NHEC0023S01
1.
Turn ignition switch “ON”.
2.
Perform “FUEL PRESSURE RELEASE” in “WORK SUP-
PORT” mode with CONSULT-II.
3.
Start engine.
4.
After engine stalls, crank it two or three times to release all fuel
pressure.
5.
Turn ignition switch “OFF”.
SEF997Z
WITHOUT CONSULT-II
NHEC0023S02
1.
Remove fuel pump fuse located in fuse box.
2.
Start engine.
3.
After engine stalls, crank it two or three times to release all fuel
pressure.
4.
Turn ignition switch “OFF”.
5.
Reinstall fuel pump fuse after servicing fuel system.
SEF030Y
Fuel Pressure Check
NHEC0024
I
When reconnecting fuel line, always use new clamps.
I
Make sure that clamp screw does not contact adjacent
parts.
I
Use a torque driver to tighten clamps.
I
Use Pressure Gauge to check fuel pressure.
I
Do not perform fuel pressure check with system operat-
ing. Fuel pressure gauge may indicate false readings.
1.
Release fuel pressure to zero.
2.
Disconnect fuel tube joint between fuel pressure regurator and
injection tube and set fuel pressure check adapter (J44321).
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BASIC SERVICE PROCEDURE
Fuel Pressure Release
EC-49
SEF031Y
3.
Install pressure gauge to the fuel pressure check adapter as
shown in the figure.
4.
Start engine and check for fuel leakage.
5.
Read the indication of fuel pressure gauge.
At idling:
With vacuum hose connected
Approximately 235 kPa (2.4 kg/cm
2
, 34 psi)
With vacuum hose disconnected
Approximately 294 kPa (3.0 kg/cm
2
, 43 psi)
If results are unsatisfactory, perform Fuel Pressure Regulator
Check.
SEC015C
Fuel Pressure Regulator Check
NHEC0025
1.
Stop engine and disconnect fuel pressure regulator vacuum
hose from vacuum gallery.
2.
Plug vacuum gallery with a blind cap.
3.
Connect variable vacuum source to fuel pressure regulator.
SEF718BA
4.
Start engine and read indication of fuel pressure gauge as
vacuum is changed.
Fuel pressure should decrease as vacuum increases. If results
are unsatisfactory, replace fuel pressure regulator.
BASIC SERVICE PROCEDURE
Fuel Pressure Check (Cont’d)
EC-50
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