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Two-Way Valve (Overfill Limiter)

  1. Two-Way valve consist of a pressure valve and a vacuum valve. Pressure valve side is designed to open when fuel tank internal pressure has increased over normal pressure, and vacuum valve side opens when vacuum has been produced in fuel tank. For Two-Way valve identification, see Fig 1. For valve test, go to next step.
  2. Connect vacuum pump to inlet side of Two-Way valve. See Fig 2. Apply vacuum, negative pressure is generated and vacuum should be held. If vacuum is not held, replace Two-Way valve. If vacuum is held, go to next step.
  3. Connect vacuum pump to outlet side of Two-Way valve. Apply vacuum, negative pressure should not be generated. If negative pressure is generated, replace Two-Way valve as necessary.
Fig 1: Identifying Two-Way Valve
G00102652Courtesy of KIA MOTORS AMERICA, INC.
Fig 2: Testing Two-Way Valve
G00102653Courtesy of KIA MOTORS AMERICA, INC.
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