Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnosis Procedure
- INSPECTION START
Check whether the following symptoms are present.
A: Fuel odor from EVAP canister is strong.
B: Cannot refuel/Fuel odor from the fuel filler opening is strong while refueling.
Which symptom is present?
A
GO TO STEP 2 .
B
GO TO STEP 8 .
- CHECK EVAP CANISTER
- Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
- Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
The weight should be less than 1.9 kg (4.2 lb).
Is the inspection result normal?
YES
GO TO STEP 3 .
NO
GO TO STEP 4 .
- CHECK IF EVAP CANISTER IS SATURATED WITH WATER
Check if water will drain from EVAP canister.
Does water drain from the EVAP canister?
YES
GO TO STEP 4 .
NO
GO TO STEP 7 .
- REPLACE EVAP CANISTER
Replace EVAP canister with a new one.
GO TO STEP 5 .
- CHECK DRAIN FILTER
Refer to COMPONENT INSPECTION (DRAIN FILTER) .
Is the inspection result normal?
OK
GO TO STEP 6 .
NO
Replace drain filter.
- DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.
Repair or replace EVAP hose.
- CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to COMPONENT INSPECTION (REFUELING EVAP VAPOR CUT VALVE) .
Is the inspection result normal?
YES
INSPECTION END
NO
Replace refueling EVAP vapor cut valve with fuel tank.
- CHECK EVAP CANISTER
- Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
- Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
The weight should be less than 1.9 kg (4.2 lb).
Is the inspection result normal?
YES
GO TO STEP 9 .
NO
GO TO STEP 10 .
- CHECK IF EVAP CANISTER IS SATURATED WITH WATER
Check if water will drain from EVAP canister.
Does water drain from the EVAP canister?
YES
GO TO STEP 10 .
NO
GO TO STEP 13 .
- REPLACE EVAP CANISTER
Replace EVAP canister with a new one.
GO TO STEP 11 .
- CHECK DRAIN FILTER
Refer to COMPONENT INSPECTION (DRAIN FILTER) .
Is the inspection result normal?
OK
GO TO STEP 12 .
NO
Replace drain filter.
- DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.
Repair or replace EVAP hose.
- CHECK VENT HOSES AND VENT TUBES
Check hoses and tubes between EVAP canister and refueling control valve for clogging, kink, looseness and improper connection.
Is the inspection result normal?
YES
GO TO STEP 14 .
NO
Repair or replace hoses and tubes.
- CHECK RECIRCULATION LINE
Check recirculation line for clogging, dents and cracks.
Is the inspection result normal?
YES
GO TO STEP 15 .
NO
Replace fuel filler tube.
- CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to COMPONENT INSPECTION (REFUELING EVAP VAPOR CUT VALVE) .
Is the inspection result normal?
YES
GO TO STEP 16 .
NO
Replace refueling EVAP vapor cut valve with fuel tank.
- CHECK FUEL FILLER TUBE
Check fuel filler tube and hose connected to the fuel tank for clogging, dents and cracks.
Is the inspection result normal?
YES
GO TO STEP 17 .
NO
Replace fuel filler tube.
- CHECK ONE-WAY FUEL VALVE-I
Check one-way valve for clogging.
Is the inspection result normal?
YES
GO TO STEP 18 .
NO
Repair or replace one-way fuel valve with fuel tank.
- CHECK ONE-WAY FUEL VALVE-II
- Make sure that fuel is drained from the tank.
- Remove fuel filler tube and hose.
- 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.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.