[Jay Laifman]

When I hook up a vacuum pump to the 1975 009 WUR, and pump up the vacuum, it slowly leaks out. I’m assuming this is wrong. But can someone confirm?

In thinking it is wrong, I made sure the large o-ring that seals the base was good and the small o-ring that seals the electrical connector was good, and used some Permatex on each. Didn’t change anything.

So that leaves:
(1) something around the diaphragm. I believe the images show an o-ring in there. But, I’ve been afraid to damage the diaphragm and there certainly is no gas leaking there.
(2) Through the atmosphere valve on the bottom of the WUR. I’ve tried to plug it to see if it stops the leak. It hasn’t really. But my plug may not be good enough. If that is bad, I can’t remotely see how to do anything about it. Other than spray it with carb cleaner and hope it cleans out some speck that is blocking the valve from fully closing.

Thanks for any help.