Secondary Diaphragm
- Disconnect secondary diaphragm vacuum hose and attach a vacuum pump with hose to diaphragm port. Open throttle valve fully and apply vacuum. See Fig 1 . Check that diaphragm rod moves as vacuum is applied and that vacuum remains steady.
- If vacuum does not hold or rod does not move, check hoses for proper connection and condition. If hoses are okay, replace diaphragm and recheck.