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PVS with 2 Connections

  1. Detach both vacuum hoses from PVS, and connect a vacuum gauge to top port on PVS. Connect other PVS nipple to manifold vacuum or external vacuum supply of at least 10 in. Hg. See Figure .
  2. Start engine and warm until engine operating temperature is reached. If no vacuum reading is noted, PVS should be replaced. If vacuum is present, PVS is okay.
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