Check Valve

Remove check valve and connect vacuum pump to Dark Blue nipple. When vacuum is applied, vacuum should leak. Connect vacuum pump to White nipple. When vacuum is applied, vacuum should hold.

Fig 1: High Altitude Compensation System (Carbureted - CA Models)

Courtesy of CHRYSLER MOTORS.

Fig 2: High Altitude Compensation System (Carbureted - Federal Models - All Others)

Courtesy of CHRYSLER MOTORS.