EVAP Vent Shut Float Test

Special Tools Required 

Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available

1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap to relieve fuel tank pressure, then reinstall the cap.
3. Remove the left rear wheel.
4. Remove the fuel pipe cover.
   Fig 1: Removing Fuel Pipe Cover

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Disconnect the fuel tank vapor recirculation tube (A), and connect a vacuum pump/gauge, 0-30 in.Hg, to the tube.
   Fig 2: Disconnecting Fuel Tank Vapor Recirculation Tube

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Apply vacuum to the fuel tank vapor recirculation tube.
   • If the valve holds the vacuum pressure, replace the fuel tank vapor recirculation tube.
   • If the valve does not hold the vacuum pressure, go to step 7.
7. Reconnect the fuel tank vapor recirculation tube.
8. Disconnect the tube (A) and (B).
   Fig 3: Disconnecting Tube

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Connect a vacuum pump/gauge, 0-30 in.Hg, to the tube (A).
10. Connect a second vacuum pump/gauge, 0-30 in.Hg, to the tube (B).
11. Apply vacuum to the tube (A), then check the vacuum on the pump in step  10.
    • If the vacuum responses immediately, check for clogging tube between the EVAP vent shut float and the EVAP canister.
    • If the vacuum does not response immediately, replace the EVAP vent shut float (see EVAP VENT SHUT FLOAT REPLACEMENT  ).