Infiniti FX35, FX50 (S51). Manual - part 895

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-1121

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

Description

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From the beginning of refueling, the air and vapor inside the fuel tank go through refueling EVAP vapor cut
valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is
released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.

WARNING:

When conducting inspections below, be sure to observe the following:
• Put a “CAUTION: FLAMMABLE” sign in workshop.
• Never smoke while servicing fuel system. Keep open flames and sparks away from work area.
• Always furnish the workshop with a CO

2

 fire extinguisher.

CAUTION:

• Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosion-proof container and put lid on securely.
- Release fuel pressure from fuel line. Refer to 

EC-1236, "Inspection"

.

- Disconnect battery ground cable.
• Always replace O-ring when the fuel gauge retainer is removed.
• Never kink or twist hose and tube when they are installed.
• Never tighten hose and clamps excessively to avoid damaging hoses.
• After installation, run engine and check for fuel leaks at connections.
• Never attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.

Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.

Component Function Check

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1.

CHECK ORVR FUNCTION

Check whether the following symptoms are present.
• Fuel odor from EVAP canister is strong.
• Cannot refuel/Fuel odor from the fuel filler opening is strong while refueling.
Are any symptoms present?

YES

>> Go to 

EC-1121, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

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1.

INSPECTION START

Check whether the following symptoms are present.
A: Fuel odor from EVAP canister is strong.

PBIB1068E

EC-1122

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

B: Cannot refuel/Fuel odor from the fuel filler opening is strong while refueling.

Which symptom is present?

A

>> GO  TO  2.

B

>> GO  TO  7.

2.

CHECK EVAP CANISTER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

2.

Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

Check if water will drain from EVAP canister (1).
• EVAP canister vent control valve (2)

Does water drain from the EVAP canister?

YES

>> GO TO 4.

NO

>> GO TO 6.

4.

REPLACE EVAP CANISTER

Replace EVAP canister with a new one.

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.

>> Repair or replace EVAP hose.

6.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-1124, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace refueling EVAP vapor cut valve with fuel tank.

7.

CHECK EVAP CANISTER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

2.

Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.1 kg (4.6 lb).

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 9.

8.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-1123

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Check if water will drain from EVAP canister (1).
• EVAP canister vent control valve (2)
Does water drain from the EVAP canister?

YES

>> GO TO 9.

NO

>> GO TO 11.

9.

REPLACE EVAP CANISTER

Replace EVAP canister with a new one.

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.

>> Repair or replace EVAP hose.

11.

CHECK VENT HOSES AND VENT TUBES

Check hoses and tubes between EVAP canister and refueling control valve for clogging, kinks, looseness and
improper connection.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Repair or replace hoses and tubes.

12.

CHECK FILLER NECK TUBE

Check recirculation line for clogging, dents and cracks. 

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace filler neck tube.

13.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-1124, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Replace refueling EVAP vapor cut valve with fuel tank.

14.

CHECK FUEL FILLER TUBE

Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks.
Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace fuel filler tube.

15.

CHECK ONE-WAY FUEL VALVE-I

Check one-way valve for clogging.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Repair or replace one-way fuel valve with fuel tank.

16.

CHECK ONE-WAY FUEL VALVE-II

1.

Check that fuel is drained from the tank.

2.

Remove fuel filler tube and hose.

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EC-1124

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

3.

Check one-way fuel valve for operation as per the following.
When a stick is inserted, the valve should open, when removing
stick it should close.
Do not drop any material into the tank.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel filler tube or replace one-way fuel valve

with fuel tank.

Component Inspection

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1.

CHECK REFUELING EVAP VAPOR CUT VALVE

1.

Turn ignition switch OFF.

2.

Remove fuel tank. Refer to 

FL-10, "Removal and Installation"

.

3.

Drain fuel from the tank as per the following:

-

Remove fuel gauge retainer.

-

Drain fuel from the tank using a handy pump into a fuel container.

4.

Check refueling EVAP vapor cut valve for being stuck to close as per the following.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.

5.

Check refueling EVAP vapor cut valve for being stuck to open as per the following.

-

Connect vacuum pump to hose end.

-

Remove fuel gauge retainer with fuel gauge unit.

Always replace O-ring with new one.

-

Turn fuel tank upside down.

-

Apply vacuum pressure to hose end [

−

13.3 kPa (

−

0.136 kg/cm

3

, 

−

1.93 psi)] with fuel gauge retainer

remaining open and check that the pressure is applicable.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace refueling EVAP vapor cut valve with fuel tank.

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PBIB1035E