Check Fuel Cap Assembly

(a) Check that the fuel cap is correctly installed and confirm the fuel cap meets OEM specifications.

(b) Tighten the fuel cap until a few click sounds are heard.

HINT:

If an EVAP tester is available, check the fuel cap using the tester.

1. Remove the fuel cap and install it onto a fuel cap adapter.

2. Connect an EVAP tester pump hose to the adapter, and pressurize the cap to 3.2 to 3.7 kPa (24 to 28 mmHg) using an EVAP tester pump.

3. Seal the adapter and wait for 2 minutes.

4. Check the pressure. If the pressure is 2 kPa (15 mmHg) or more, the fuel cap is normal.

Result

Test Results

Suspected Trouble Areas

Proceed To

Fuel cap correctly installed

-

A

Test Results

Suspected Trouble Areas

Proceed To

Fuel cap loose

• Fuel cap improperly installed

• Defective fuel cap

• Fuel cap does not meet OEM specifications

B

Defective fuel cap

-

B

No fuel cap

-

C

(c) Reinstall the fuel cap.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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Responses

  • terri
    How to check if fuel cap is faulty toyota rav4?
    2 years ago

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