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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1566 (Evaporative Emissions System) >> General Procedures >> Evaporative Emission System Leak Test >> Phase 2 - System Leak Check

Phase 2 - System Leak Check

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: The fire suppression system backup power supply must be depleted before lifting the vehicle or when repairing or replacing any of the following:
    • Fire suppression system components
    • Components located near the fire suppression manual switch
    • Fuel tank and components located near the fuel tank
    • Rear axle and components located near the rear axle

    To deplete the backup power supply, disconnect the battery and wait at least 1 minute. Be sure to disconnect all auxiliary batteries and power supplies (if equipped). Failure to follow these instructions may result in serious personal injury.

  1. Disconnect the upper vapor tube-to-EVAP canister purge valve quick connect coupling. For additional information, refer to FUEL SYSTEM - GENERAL INFORMATION article.
  2. Connect the VACUTEC Smoke Machine Fuel Evaporative Emission System Tester to the upper EVAP canister purge valve fitting. For additional information, refer to the manufacturer's instructions.
    3. NOTE: The battery ground cable was previously disconnected in the vapor tube quick connect coupling procedure.
  3. Connect the battery ground cable. For additional information, refer to BATTERY, MOUNTING AND CABLES article.
    4. NOTE: In the scan tool, the EVAP canister purge valve is referred to as the EVAP vapor management valve.
  4. Open the EVAP canister purge valve with the scan tool.
  5. Close the canister vent solenoid with the scan tool.
  6. Carefully turn the fuel tank filler cap counterclockwise until the thread disengages and position aside.
    7. NOTE: If smoke does not exit the fuel tank filler pipe neck area after the system is pressurized, open the canister vent solenoid with the scan tool to allow the air to purge. Once smoke is seen at the canister vent solenoid, close the canister vent solenoid with the scan tool.
  7. Introduce smoke from the VACUTEC Smoke Machine Fuel Evaporative Emission System Tester into the EVAP system and verify that smoke is exiting the fuel tank filler pipe neck area. For additional information, refer to the manufacturer's instructions.
  8. Install the fuel tank filler cap once smoke is observed exiting the fuel tank filler pipe neck area.
  9. Continue to enter smoke into the system for 60 seconds to obtain pressure.
  10. Press and release the remote start button in intervals of 15 seconds ON and 15 seconds OFF while checking for exiting smoke.
  11. Use the halogen light provided with the VACUTEC Smoke Machine Fuel Evaporative Emission System Tester to follow the EVAP system path and look for smoke exiting at the source of the leak(s).
  12. Repair any leaks as necessary.
    13. WARNING: If the vehicle is equipped with a fire suppression system, repower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM article. Failure to follow these instructions may result in serious personal injury.
  13. Repeat the leak test until the system passes.
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