1975 Models
- Disconnect altitude compensator valve-to-evaporation compensator valve hose from evaporation compensator valve. Disconnect pressure sensing hose from evaporation compensator valve at "T" fitting.
- Start and run engine at idle. Close inlet to evaporation compensator valve. Engine speed should not change noticeably. Connect hose at "A" and apply air pressure to sensing hose. See Fig 1. There should be no increase in engine speed.