Quote:
Originally Posted by Abner Mality
If the valve works okay using the vacuum from my hand-held pump, then I now know to look for oil in the line from the ignition switch; right?
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Oil in the line typically happens because the diaphragm fails in the shut off valve. If it's working ok, there's no reason to look for oil in the line. You should look for leaks in the system if the shut off valve is working ok. Vacuum should be higher than 16 at sea level, more like 21.
Vacuum set up on a 79 SD is different than the 123's. There are two lines coming from the pump, not one like the 123's. Maybe the 80 SD's are similar. I had a leak at the small line rubber union at the pump.
Vibration could be worn motor mounts and engine shocks.