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.
EVAP Canister Check
- Canister Purge
- Vapor
- Vent
An improperly functioning EVAP canister can cause problems with engine driveability and/or vehicle refueling. The canister can become plugged (with some internal obstruction or liquid fuel) or develop an air leak.
Stalling or poor driveability can be caused by:
- Fuel saturated canister. Disconnect the EVAP canister purge line at the underbody (near the fuel filter/regulator) and look for liquid fuel in the line.
- If liquid fuel is present, install a siphon hose on this line and attempt to draw out more fuel.NOTE: If liquid fuel is present, the canister must be replaced.
- If fuel is in the canister, investigate the vapor venting of the system. Refer to DIAGNOSING FUEL FILL PROBLEMS .
- If liquid fuel is present, install a siphon hose on this line and attempt to draw out more fuel.
- No canister purge function. Check DTC codes for PO446 and refer to FAULT ISOLATION
article.
Evidence of fuel loss or fuel vapor odor can be caused by:
- Cracked or damaged EVAP canister.
- Fuel saturated EVAP canister (evaluate as noted above).
NO RELATED
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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.