Quote:
Originally Posted by scottfab
First thing to do is test the vacuum on the pump. Many failures are in partial vacuum and/or internal leakage.
A slow leak under the plenum will not be an issue. the fact that you get an initial "pull" is a good sign that the leak under the plenum can be overcome.
Test pump.
1. unplug hose at the junction half way up to the plenum
(or right at the pump).
2. plug the pump end of the hose. The pump should run for a few seconds and stop. Hold the seal tight. It should NOT turn back on.
If it does or the pump runs for say 10seconds before shutting off
then the diaphragm is leaking inside the pump.
The good news is that these can be reworked. I just did this and posted a few pics. It will work until you get a replacement. Or in my case for another 10yrs until it fails again.
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I tested the pump, I put my thumb over the inlet and it would turn off and stay off, as soon as I plug it back into the car it will run for 5-10 seconds then start to cycle on and off..it will run for maybe a second then stay off for 2 or 3, then on again....Definately a leak under the plenum. I got a mightyvac gauge yesterday and I can pump it up to 15 and it will slowly leak down to zero in about 3 to 4 seconds.