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Home >> Honda >> 2004 >> Pilot EX >> Repair and Diagnosis >> Engine Performance >> System >> EVAP System >> Fuel Tank Vapor Control Valve Test >> Valve Test
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Valve Test

  1. Make sure the fuel tank is less than half full.
  2. Remove the fuel fill cap.
  3. Disconnect the fuel tank vapor signal tube (A).
    Fig 1: Disconnecting The Fuel Tank Vapor Signal Tube
    G01464278Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Remove the EVAP canister cover (see step 1 on EVAP Canister Replacement  ).
  5. Disconnect the vacuum hoses (A) from the EVAP canister (B), then plug the ports with plugs (C).
    Fig 2: Disconnecting The Vacuum Hoses From The EVAP Canister
    G01464279Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Disconnect the vacuum hose (D) from the EVAP canister vent shut valve (E), and connect a vacuum pump to the vacuum hose.
  7. Pump the vacuum pump 80 times.
    • If the vacuum holds, go to step 8.
    • If the vacuum does not hold, go to step 11.
  8. Connect a second vacuum pump to the fuel tank vapor signal tube (A).
    Fig 3: Connecting A Second Vacuum Pump To The Fuel Tank Vapor Signal Tube
    G01464280Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Apply vacuum (1 pump) to the fuel tank vapor signal tube (A), then check the vacuum on the pump in step 7.
    • If the vacuum holds, replace the fuel tank vapor control valve (see EVAP Canister Replacement  ).
    • If the vacuum is released, the EVAP canister vent shut valve is OK. Go to step 10.
    10. NOTE: At either location, tiny droplets of fuel are normal.
    Fig 4: Checking For Fuel In The EVAP Two Way Valve Hoses
    G01464281Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 5: Checking For Fuel In The Fuel Tank Vapor Recirculation Hose
    G01464282Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Fill the fuel tank with fuel, then check for fuel in the EVAP two way valve and fuel tank vapor recirculation hose.
    • If fuel runs out of the hoses at either location, replace the fuel tank vapor control valve.
    • If the fuel does not run out of the hoses at either location, the fuel tank vapor system function is normal.
  11. Disconnect the fuel tank vapor quick connect from the EVAP canister, then plug the port on the canister. Reapply vacuum (80 pumps).
    • If the vacuum holds, replace the EVAP canister vent shut valve (see step 28 on EVAP Canister Purge Valve Test  ).
    • If the vacuum does not hold, inspect the EVAP canister vent shut valve O-ring. If the O-ring is OK, replace the EVAP canister and repeat step 5.
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