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Old 12-18-2011, 10:04 PM
STL Mark STL Mark is offline
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Join Date: Dec 2006
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Just a guess, but it sounds like 1) a plumbing problem with that vacuum booster, and 2) that booster may not be secured properly. I have the same unit, and have had the same problems. Once it's plumbed correctly, and secured (check it twice a year) it will be fine.

just my .02
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