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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 147 (EVAP SYSTEM)EVAP VENT SHUT FLOAT TEST
2002 Honda Civic Si

EVAP Vent Shut Float Test

2002 Honda Civic SiSECTION EVAP Vent Shut Float Test
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

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
    G03704690Courtesy 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
    G03704691Courtesy 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
    G03704692Courtesy 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  ).
RENDER: 1.0x

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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.