I have never had much luck servicing these (other than freeing up a stuck
impeller) but if yours has fallen apart then you have completed the tricky
first step.

My recollection is that the impeller just goes on the motor shaft and the
base piece completes the package.  If your is in more pieces than that then
I can't help.  I'm thinking the bottom/base piece was glued, not just
snapped on -- but it has been a long time.

Geo

----- Original Message -----
From: "keithpike" <keithpike@NF.SYMPATICO.CA>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, August 08, 2009 2:34 PM
Subject: domestic water pump not pumping '89 Westy

>...the pump appears to be apart and laying on
> the  bottom of the water tank. I have never seen it before, so I don't
> know
> the configuration. How does it all fit together?