Vacuum Test (Mechanical)
- Reconnect fuel line to carburetor inlet and check for leaks.
- Disconnect hose at inlet side of fuel pump. Raise end of hose so fuel will not run out.
- Connect vacuum gauge to pump inlet with short length of hose.
- Start engine and allow to idle. Check vacuum level. Gauge should read at least 5-7.7.7 in. Hg (Ford); If not, replace pump.