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Vacuum Amplifier

  1. Start and warm engine to normal operating temperature. Detach vacuum amplifier hose from thermo valve and connect vacuum gauge to this hose. Detach vacuum amplifier hose from carburetor.
  2. Depress accelerator pedal several times, then allow engine to return to idle. Vacuum gauge should read 2.0-2.4 in. Hg.
  3. Connect amplifier hose back to carburetor. Increase engine speed to 3500 RPM. Vacuum gauge should now read 3.54 in. Hg. If amplifier does not test as indicated, it should be replaced.
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