Reference Pressure Regulator
Install "T" fitting at connection "A". See Fig 1. Connect a vacuum gauge to "T" fitting. Start and run engine at idle. Note vacuum reading. Compare reading with specification, and replace pressure regulator if vacuum reading is incorrect. See ALTITUDE COMPENSATED VACUUM table.
Fig 1: Testing Reference Pressure Regulator Install vacuum gauge "T" fitting at connection "A". Courtesy of American Motors/Jeep Corp.
ALTITUDE COMPENSATED VACUUM
| Altitude (Ft.) | Vacuum (Inches Hg) |
|---|---|
| 0 | 8-10 |
| 1000 | 7-9 |
| 2000 | 6-8 |
| 3000 | 4.5-6.5 |
| 4000 | 3-5 |
| 5000 | 2-4 |