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Old 03-31-2013, 04:27 PM   #261
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Joined: Jul 2007
Location: Garden City, Michigan
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Quote:
Originally Posted by Grinnin View Post
You are correct that it could be the diaphragm. But it could be a flapper valve.

If either valve is not working -- either not sealing or not opening -- the pump would show the symptom you describe: no vacuum on the inlet side. The pump could be simply "breathing" through one side or it could be stuck and acting as an air shock absorber.

Please excuse a post full of speculation.
That is a very good point, and probably the more likely cause.But either way the diaphram gasket needs to be replaced since they are both integrated on it.
Also, I was told a while back that Ims doesn't sell a rebuild kit, just the whole pump assembly.That seems rediculous.
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