PVS with 2 Connections
- Detach both vacuum hoses from PVS, and connect vacuum gauge to top port on PVS. Connect other PVS nipple to manifold vacuum or external vacuum supply of at least 10 in. Hg.
- 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.