Car encyclopedia

Evaporative Leak Detection Pump

The evaporative leak detection pump is used to build pressure in the evaporative control (EVAP) system each time the self-diagnostic leak check is performed by the engine control computer.

Symptoms of Wear or Failure

  • Illumination of the Check Engine Light

Related Repair Advice

  • The size of the evap system leak is determined by how long/often the leak detection pump must run to maintain a specified pressure in the evap system

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