Norm:
It is not really possible to answer your question with the information you
posted. The center of the drive shaft is offset from the center of the
impeller housing. Whichever side has the most volume will be the inlet and
the other side will be the outlet. Or another way of saying this is the side
closest to the drive shaft will be the outlet. The pumping action occurs as
the vane sweeps from a large volume to a smaller one. When you look at it
with the cover removed it will be obvious which way the vane turns to pump
once you understand the pumping mechanics. It would be best to orient the
vanes so they sweep out opposite to the rotation direction. If you install
the vanes the wrong way, don't worry, they will flip over on the first rev
or so.

I also coat the vanes with some non petroleum based lubricant like Lanacoat.

David
"engsol" wrote in message
...
OK, here's where you old salts can set me straight.
Visualize an impeller pump as being a T...with the vertical part of
the T being replaced by a circle, i.e., the impeller. Now assume the arms
of the the T are labeled IN/OUT (left) and OUT/IN.(right)

The question is...for a given rotation (direction) of the impeller,
which direction is the water going to flow..and which direction
should the impeller vanes be flopped...with the rotation or against
the rotation..if that makes sense.

An ancillerary question....before you install the pump, do you
need to fix the impeller vanes properly depending on the
anticipated rotation? And if you don't...what happens?

Thanks
Norm B