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HOMESERVICE MANUALSLINCOLN2009NAVIGATOR L RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALAUXILIARY EMISSION CONTROL SYSTEMSEVAPORATIVE EMISSIONS SYSTEMGENERAL PROCEDURESEVAPORATIVE EMISSION SYSTEM LEAK TESTPHASE 2 - SYSTEM LEAK CHECK
2009 Lincoln Navigator L RWD

Phase 2 - System Leak Check

2009 Lincoln Navigator L RWDSECTION Phase 2 - System Leak Check
  1. Disconnect the fuel 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 EVAP  Emissions System Tester to the fuel vapor tube quick connect coupling. For additional information, refer to the manufacturer's instructions.
    3. NOTE: The battery ground cable was previously disconnected in the fuel vapor tube quick connect coupling procedure.
  3. Connect the battery ground cable. For additional information, refer to BATTERY, MOUNTING AND CABLES article.
  4. Close the canister vent solenoid with the scan tool.
    5. NOTE: The supplemental refueling adapter is located in the jack storage compartment.
  5. Install the supplemental refueling adapter into the Easy Fuel™ (capless) fuel tank filler pipe assembly.
    6. 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.
  6. Introduce smoke from the VACUTEC Smoke Machine Fuel EVAP  Emissions 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.
  7. Remove the supplemental refueling adapter once smoke is observed exiting the fuel tank filler pipe neck area.
  8. Continue to enter smoke into the system for 60 seconds to obtain pressure.
  9. Press and release the remote start button in intervals of 15 seconds ON and 15 seconds OFF while checking for exiting smoke.
  10. Use the halogen light provided with the VACUTEC Smoke Machine Fuel EVAP  Emissions System Tester to follow the EVAP  system path and look for smoke exiting at the source of the leak(s).
  11. Repair any leaks as necessary.
  12. Repeat the leak test until the system passes.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.