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Gulp Valve: MGB

  1. Disconnect air supply hose to gulp valve at the air pump. Connect a vacuum gauge, using a "T" fitting, to the disconnected end of hose. Start and idle engine.
  2. Temporarily block off open end of "T" fitting and check that vacuum gauge reads zero for approximately 15 seconds. If vacuum is registered, replace gulp valve.
  3. With open end of "T" fitting still blocked off, quickly open, then close throttle. Vacuum gauge should indicate vacuum. Repeat this several times, unblocking "T" fitting after each time to allow vacuum to escape. If gauge fails to register vacuum, replace gulp valve.
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