No, you should only have one pump.

There are two variations... some westies have the pump in the tank, some
have it below the little shelf at the bottom of the sink compartment. I
don't know when Wesfalia made the changeover (or even if they switched back
& forth more than once). I do know that my US market '85 has the pump in
the water tank.

I suspect that any self-priming RV pump would work nicely.

Tim

At 02:44 PM 7/16/2004 -0500, Harmon Seaver wrote:
>   My '82 westy sink pump doesn't work, or at least doesn't pump. It
>runs, but very little comes out. I pulled it up, it's an Atwood
>6126. Seems to spin fine, but even putting the intake into a glass of
>water, nothing comes out. Haven't tried yet setting up some sort of
>priming, since the impellers look okay, maybe that's it. I'm not sure
>this is the stock pump, and, in fact, the wiring to it looks
>definitely non factory.
>    Resorting to looking in Bently, I see that there is apparantly
>supposed to be a pump in the tank itself, and it looks like there are
>two pumps then -- is this correct? I have no pump in my tank, no wires
>going to it, although there is the grommet in the top for the wires as
>per the manual picture. Hmmm. I thought that was an air vent
>previously. So why would they have two pumps, if that indeed was the
>case?
>    Is there a good self-priming RV pump that would work?
>
>
>  --
>Harmon Seaver
>CyberShamanix
>http://www.cybershamanix.com
>Hoka hey!