Evaporative Emissions System: Testing and Inspection

Evaporative Emission System Leak Test





Phase 1 - Leak Verification

1. Disconnect the upper vapor tube-to-Evaporative Emission (EVAP) canister purge valve quick connect coupling. For additional information, refer to Fuel System - General Information Service and Repair.

2. Connect the VACUTEC Smoke Machine Fuel Evaporative Emission Tester to the upper EVAP canister purge valve fitting. For additional information, refer to the manufacturer's instructions.

3. Connect the scan tool and open the EVAP canister purge valve.

4. Using the scan tool, close the EVAP canister vent solenoid. For additional information, refer to the manufacturer's instructions.

5. Using the VACUTEC Smoke Machine Fuel Evaporative Emission Tester, pressurize the EVAP system.

6. Monitor the indicator flag on the VACUTEC Smoke Machine Fuel Evaporative Emission Tester. If the measurement is below the indicator flag, the system has passed the leak test and the test procedure is complete. If the measurement is above the indicator flag, the system has failed the leak test. Proceed to Phase 2.

Phase 2 - System Leak Check

1. Introduce smoke from the VACUTEC Smoke Machine Fuel Evaporative Emission Tester into the EVAP system. For additional information, refer to the manufacturer's instructions.

2. Use the halogen light provided with the VACUTEC Smoke Machine Fuel Evaporative Emission Tester to look for smoke coming from the EVAP system. This would indicate a leak point.

3. Repair any leaks as necessary.

4. Repeat the leak test until the system passes.