Car encyclopedia

Canister Vent Valve

The canister vent valve closes the fuel tank vent to prevent outside air from entering the EVAP system during an evaporative system leak test.

Symptoms of Wear or Failure

  • Check Engine Light may illuminate
  • Fuel tank may be hard to fill

Related Repair Advice

  • Evaporative system diagnosis can be difficult and trouble codes can be triggered by sensors and components other than the canister vent valve
  • Due to its common location under the vehicle, the vent valve may become clogged with dirt and debris

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