Evap System and Fuel Tank Venting (Gasoline)

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

The EVAP system captures fuel vapors from the tank, preventing them from escaping to atmosphere.

System Components

  • Charcoal canister — absorbs vapors
  • Purge valve — ECU-controlled release to intake
  • Vent valve — allows fresh air in

Common Fault Codes

  • P0440 — EVAP malfunction
  • P0442 — Small leak (often gas cap)
  • P0455 — Large leak

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