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Old 03-31-2013, 05:03 PM   #260
Grinnin
Forever N00b
 
Joined: Dec 2005
Location: Maine
Oddometer: 2,577
Quote:
Originally Posted by GAS GUY View Post
I have a good vacuum signal going in from the engine but the inlet pickup side of the pump had nothing so the diaphram in the pump body is not working.
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.
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Grinnin screwed with this post 03-31-2013 at 05:11 PM
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