Lee, one problem I can see is that by hanging the pump by the suction and discharge you open up the possability of the weight of the motor creating small leaks in your seal around the housing.. this could allow for the air you are talking about. maybe try to suport the weight of the pump somehow to take the strain off the joints.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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