Refueling Vapor Recovery System: Testing and Inspection

DIAGNOSTIC PROCEDURE




SYMPTOM: Fuel odor from EVAP canister is strong.




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

COMPONENT INSPECTION




Refueling control valve
Check refueling control valve as follows:
1. Check visually for cracks in the appearance.
2. Check air continuity between port A and B.
Blow air into the port A. Air should flow freely through port B.
3. Blow air into port C and check there is no leakage.
4. Apply pressure to both port A and C [20 kPa (150 mmHg, 5.91 inHg)] and check there is no leakage from port B.
If NG, replace refueling control valve.




Refueling EVAP vapor cut valve
1. Remove fuel tank. Refer to "FUEL SYSTEM". Drain fuel from the tank as follows:

With CONSULT-II
a. Remove fuel feed hose located on the fuel gauge retainer, and then connect a spare fuel hose to other side of the fuel container.
b. Drain fuel using "FUEL PUMP RELAY" in "ACTIVE TEST" mode with CONSULT-II.

Without CONSULT-II
a. Remove fuel gauge retainer.
b. Drain fuel from the tank using a hand pump into a fuel container.

2. Check valve head appearance visually for cracks.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve, 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 cut valve.
b. Remove fuel gauge retainer with fuel gauge unit.
Always replace O-ring with new one.
c. Put fuel filler tank upside down.
d. Apply negative pressure [-13.3 kPa (-100 mmHg, -3.94 inHg)] with fuel gauge retainer remaining open and check that the pressure is applicable.
If NG, replace refueling EVAP vapor cut valve with fuel tank.




One-way fuel valve
1. Drain fuel from the tank.
Refer to "COMPONENT INSPECTION" of refueling EVAP vapor cut valve.
2. Remove fuel filler tube and hose.
3. Check one-way fuel valve for operation.
When a stick is inserted, the valve should open, when removing stick it should close.
Do not drop any material into the tank.
If NG, replace one-way fuel valve with fuel tank.