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Fuel Breather Line and Suction Line Inspection

  1. 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.
  1. Start the engine, and check the vacuum.
  1. Turn the ignition switch to LOCK (0).

  1. 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 blockage in the suction line. If there is blockage, replace the suction line.
    • If the line does not hold vacuum, go to Step 6 .
  1. Lift the vehicle, and support it with jackstands.

  1. Remove the fill neck tube cover (A).

  1. Disconnect the breather line (A), then plug the suction joint (B) with a rubber cap (C).

  1. 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 blockage in the breather line between the fuel tank and the suction joint. If there is blockage, replace the fuel tank.
    • If the line does not hold vacuum, go to Step 12 .
  1. Lift the vehicle, and support it with jackstands.

  1. Connect a vacuum pump/gauge, 0−30 in.Hg (A) to the filler side of the breather line (B), and apply air pressure to the line.
    • If the air pressure holds, check for blockage between the suction line and the filler neck on the breather pipe, and replace the part that is causing the blockage.
    • If the air pressure does not hold, go to Step 13 .
  1. Remove the rubber cap from the suction line, and reconnect the breather pipe to the suction line.

  1. Connect a vacuum pump/gauge, 0−30 in.Hg (A) to the suction line (B), and apply pressure to the line.
    • If the air pressure holds, the breather line and the suction line are OK.
    • If the air pressure does not hold, check for a vacuum leak in the suction line, and replace the suction line if necessary.