Infiniti G20 (P11). Manual — part 159
10
CHECK REFUELING EVAP VAPOR CUT VALVE
Without CONSULT-II
1. Remove fuel tank. Refer to FE-5, “FUEL SYSTEM”.
2. Drain fuel from the tank as follows:
a. Remove fuel level sensor unit retainer.
b. Drain fuel from the tank using a hand pump into a fuel container.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from hose end B), and check that the air flows freely into the tank.
4. Check EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose ends A and B using a suitable 3-way connector.
b. Remove fuel level sensor unit retainer with fuel level sensor unit.
Always replace O-ring with new one.
c. Put fuel tank upside down.
d. Apply vacuum pressure to both hose ends A and B [−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel level sensor unit
retainer remaining open and check that the pressure is applicable.
SEF968X
OK or NG
OK
©
GO TO 11.
NG
©
Replace refueling EVAP vapor cut valve with fuel tank.
11
CHECK FUEL FILLER TUBE
Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks.
OK or NG
OK
©
GO TO 12.
NG
©
Replace fuel filler tube.
12
CHECK ONE-WAY FUEL VALVE-I
Check one-way valve for clogging.
OK or NG
OK
©
GO TO 13.
NG
©
Repair or replace one-way fuel valve with fuel tank.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
On Board Refueling Vapor Recovery (ORVR) (Cont’d)
EC-47
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.
Positive Crankcase Ventilation
DESCRIPTION
NCEC0022
SEF833X
This system returns blow-by gas to the intake collector.
The positive crankcase ventilation (PCV) valve is provided to conduct 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 duct into the crankcase. In this process the air passes through
the hose connecting 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 intake collector under all conditions.
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
On Board Refueling Vapor Recovery (ORVR) (Cont’d)
EC-48
SEC137A
INSPECTION
NCEC0023
PCV (Positive Crankcase Ventilation) Valve
NCEC0023S01
With engine running at idle, remove PCV valve from rocker cover.
A properly working valve makes a hissing noise as air passes
through it. A strong vacuum should be felt immediately when a fin-
ger is placed over the valve inlet.
ET277
Ventilation Hose
NCEC0023S02
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.
GI
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LC
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Positive Crankcase Ventilation (Cont’d)
EC-49
SAT845J
SEF214Y
Fuel Pressure Release
NCEC0024
Before disconnecting fuel line, release fuel pressure from fuel
line to eliminate danger.
WITH CONSULT-II
NCEC0024S01
1.
Start engine.
2.
Perform “FUEL PRESSURE RELEASE” in “WORK SUP-
PORT” mode with CONSULT-II.
3.
After engine stalls, crank it two or three times to release all fuel
pressure.
4.
Turn ignition switch OFF.
SEF834X
WITHOUT CONSULT-II
NCEC0024S02
1.
Remove fuse for fuel pump.
2.
Start engine.
3.
After engine stalls, crank it two or three times to release all fuel
pressure.
4.
Turn ignition switch OFF and reconnect fuel pump fuse.
SEF826X
Fuel Pressure Check
NCEC0025
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 hose from fuel feed tube (engine side).
3.
Install pressure gauge between fuel hose and fuel feed tube.
4.
Start engine and check for fuel leakage.
5.
Read the indication of fuel pressure gauge.
At idle speed:
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, EC-51.
BASIC SERVICE PROCEDURE
Fuel Pressure Release
EC-50
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