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Home >> Honda >> 2000 >> Accord DX, Standard >> Repair and Diagnosis >> Engine Performance >> System >> EVAP System (4-CYL) >> Fuel Tank Vapor Control Valve Test >> Valve Test

Valve Test

  1. Make sure the fuel tank is less than half full.
  2. Remove the fuel fill cap.
  3. Remove the left rear inner fender. Disconnect the fuel tank vapor signal tube (A).
    Fig 1: Disconnecting Fuel Tank Vapor Signal Tube
    G02557508Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Disconnect the vacuum hose (A) from the EVAP canister (B), and then plug the ports with plugs (C).
    Fig 2: Disconnecting Vacuum Hose From EVAP Canister & Plugging Ports
    G02557509Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Disconnect the vacuum hose (D) from the EVAP canister vent shut valve (E), and connect a hose (F) and a vacuum pump to the EVAP canister vent shut valve.
  6. Pump the vacuum pump 80 times.
    • If the vacuum holds, go to step 7.
    • If the vacuum does not hold, go to step  10.
  7. Connect a second vacuum pump to the fuel tank vapor signal tube (A).
    Fig 3: Connecting Vacuum Pump To Fuel Tank Vapor Signal Tube
    G02557510Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Apply vacuum to the fuel tank vapor signal tube, then check the vacuum on the pump in step  6.
  9. Fill the fuel tank with fuel, then check for fuel in the two-way valve and fuel tank vapor recirculation hose (B).
    NOTE: At either location, tiny droplets of fuel are normal.
    • If fuel runs out of the hoses at either location, replace the fuel tank vapor control valve.
    • If fuel does not run out of the hoses at either location, the fuel tank vapor control system is normal.
      Fig 4: Checking For Fuel In Two-Way Valve & Fuel Tank Vapor Recirculation Hose
      G02557511Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Disconnect the fuel tank vapor hose quick disconnect from the EVAP canister, then plug the port on the canister. Reapply vacuum (80 pumps).
    • If the vacuum holds, replace the fuel tank vapor vent shut valve (see Fuel Tank Vapor Control Valve Replacement  ).
    • 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  4.
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