[C320-list] Potable water pump issues

[Graeme Clark]

I had this problem and dismantled the pump which contains four small non-return valves which are essentially rubber discs that sit over a hole in a plate.
The tiniest bit of grit or other foreign body that gets trapped between the rubber and the plate prevents a perfect seal and the pressure on the downstream side of the valve slowly bleeds away and thus the pump kicks in again.
I have to say that it wasn't a pretty sight and rather put me off using the potable water for anything potable!

(As an aside I bought a small pencil camera on the end of 30ft of cable that plugs into a laptop USB port and enables viewing the interior of pipes as small as 1/2 inch. When I put this down the water filler hoses of my 320 I was again somewhat disturbed by the algae and other matter that is clinging to the side - these tubes are corrugated and trap moisture. I plan to replace them over the winter with smooth sided clear plastic braided hose.)

Graeme

> 
> ------------------------------
> 
> Message: 2
> Date: Sat, 25 Oct 2014 10:30:55 -0700
> From: Gene Helfman <genehelfman at gmail.com>
> To: C320-List at catalina320.com
> Cc: c320-list at lists.catalina320.com
> Subject: [C320-list] Potable water pump issues
> Message-ID:
> 	<CAG63oPO0S1aFm+k6-HG8VYPr3VAHTOQ0F6gDcL6cAmhk70LvUA at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
> 
> Our Shurflo 2088-423-244 periodically continues to run after faucet valve
> is turned off (over sink or in head).  Sometimes we can shut it off by
> opening and closing faucet once more but sometimes we have to turn off the
> breaker on the breaker panel.  We also have to throw that breaker at night
> because the pump comes on without opening a faucet.  Also, it stops pumping
> from forward tank, spitting air until we open both forward and aft tank
> valves.
> 
> 
> 
> SO: is this a known problem, are there parts that likely need replacing, or
> should we just replace the entire pump (which is going to be challenging
> given how tight the space is where it lives).  BTW: Shurflo says the
> 2088-423-244 has been replaced by model #3901-0216. Can I assume that all
> the connections match up?
> 
> 
> 
> Thanks,
> 
> Gene
> 
> Satori, #398, 1997
> -- 
> Gene Helfman, Professor Emeritus
> Odum School of Ecology, University of Georgia
> PERMANENT address:
>    498 Shoreland Dr., Lopez Is., WA 98261
>    (360) 468-2136
>    genehelfman at gmail.com
>