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Duncan Sterling
06-30-2005, 08:32
In the process of troubleshooting my heater controls, I happened to check the vacuum pump to make sure it was working.

When I hooked up the gauge to the pump and started the engine, I noticed that the needle rapidly bounced from about 16 to about 22, never settling down.

Is this normal, or should the reading be steady at 18 or so?

TIA,

--Duncan
DmaxMaverick
06-30-2005, 11:23
Does you gage/hose have a check valve in it. If so, you need to disable the check to show falling vacuum. Some have a check valve to show high/low values if you need to monitor it and are not able to keep eyes on it.

Other than that, 16-22" is within the operating range, 16 being minimum. A new ,good pump should show about 21".
Duncan Sterling
07-01-2005, 03:53
Originally posted by DmaxMaverick:
Other than that, 16-22" is within the operating range, 16 being minimum. A new ,good pump should show about 21". So it's normal for the gauge to rapidly bounce back and forth between 16 and 21 then?

--Duncan