No. 3 Purge Control Valve
- Disconnect hoses and remove No. 3 purge control valve. Connect vacuum pump/gauge to single port. Blow into port A and ensure air does not flow from port B. See Fig 1 .
- Apply about 3 in. Hg vacuum to port and blow into port A again. Air should flow through port B. If valve does not operate as outlined, replace No. 3 purge control valve.