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Breather Line and Suction Line Inspection

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required 

  1. Remove the center console (see CENTER CONSOLE REMOVAL/INSTALLATION ).
  2. Remove the parking brake lever, then remove the access panel from the floor (see REMOVAL  ).
  3. Disconnect the suction line (A) from the, fuel tank unit, and connect a vacuum pump/gauge, 0-30 in.Hg (B) to the hose as shown below.
  4. Start the engine, and check the vacuum.
    • If there is vacuum, go to step  5.
    • If there is no vacuum, replace the fuel filter (see FUEL FILTER REPLACEMENT  ).
      • Fig 1: Identifying Suction Line & Vacuum Pump/Gauge
      G05953142Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Turn the ignition switch to LOCK (0).
  6. Attach the fuel pressure gauge attachment. Then connect a vacuum pump/gauge, 0-30 in.Hg (A) to the suction line (B), and apply vacuum to the line.
    • If the line holds vacuum, check for a blockage in the suction line. If there is a blockage, replace the suction line.
    • If the line does not hold vacuum, go to step  7.
      Fig 2: Connecting Vacuum Pump/Gauge To Suction Line
      G05953143Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Raise the vehicle on a lift.
  8. Remove the fuel tank mount bracket (A).
    Fig 3: Fuel Tank Mount Bracket With Torque Specifications
    G05953144Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Disconnect the breather line (A). Attach the fuel pressure gauge attachment, then plug the suction line (B) with a rubber cap (C).
    Fig 4: Identifying Breather Line, Suction Line & Rubber Cap
    G05953145Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Attach the fuel pressure gauge attachment. Then connect a vacuum pump/gauge, 0-30 in.Hg (A) to the suction line (B), and apply vacuum to the line.
    • If the line holds vacuum, check for a blockage in the suction line and the fuel tank vapor recirculation tube. If there is a blockage, replace the fuel tank (see FUEL TANK REPLACEMENT  ). If the fuel tank vapor recirculation tube is OK, replace the suction line.
    • If the line does not hold vacuum, go to step  11.
      Fig 5: Connecting Vacuum Pump/Gauge To Suction Line
      G05953146Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Raise the vehicle on a lift.
  12. Connect a T-fitting (A) from the vacuum gauge and vacuum pump/gauge 0-30 in.Hg (B), to the filler side of the breather line (C) as shown below. Then apply pressure to the line.
    • If the pressure holds, check for a blockage between the suction line and the filler neck on the breather pipe, then replace the part that is causing the blockage.
    • If the pressure does not hold, go to step  13.
      Fig 6: Connecting T-Fitting From Vacuum Gauge & Vacuum Pump/Gauge To Filler Side Of Breather Line
      G05953147Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Remove the rubber cap from the suction line, and reconnect the breather pipe to the suction line.
  14. Attach the fuel pressure gauge attachment. Then connect a T-fitting (A) from the vacuum pump/gauge 0-30 in.Hg (B), to the suction line (C) as shown below. Then apply pressure to the line.
    • If the pressure holds, the breather line and the suction line are OK.
    • If the pressure does not hold, check for a vacuum leak in the suction line, and replace the suction line if needed.
      Fig 7: Connecting T-Fitting From Vacuum Pump/Gauge To Suction Line
      G05953148Courtesy of AMERICAN HONDA MOTOR CO., INC.
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