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Except Vanagon

  1. Remove hoses from gravity valve. Remove valve from body, above and to the right of the fuel tank. See Figure . Attach one end of a hose to valve's expansion tank port. Submerge other end of hose in water.
  2. Hold valve vertically. Blow into valve's port to fuel separator. Check that air flows through valve into water. Gradually tilt valve while blowing air into it. Check that air stops flowing through valve when it is tilted at a 45 degree angle. If valve does not function properly, replace it.
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