Fresh water pump

[sail4dale]

CAt 34 MkII 1582  I find that my pump cycles about every 10 seconds.  No external leaks were found.  Has anyone found the internal check valving in the pump to allow back-flow to the inlet side?  That would allow the presure to decay and \cycle the pump on.

[amoreau]

Hi, My fresh water pump cycles about the same as yours.  It doesn't do it all the time though.  I been wanting to take the pump apart.  Maybe this season.

[Bill]

My fresh water pump did the same thing.  I could see water moving back through the clear plastic ball with the screen in it.  The pump would cycle about every 10 to 30 seconds for about 1 second.  I called the manufacuter and they sent me two new check valves.  It is a fairly simple job to replace the check valve.

Bill Jenks
2000  #1484
Unzipped

[sail4dale]

latest installment on the cycling water pump.  In reading about leaking hot water heater relief valves, I checked mine.  It stood to reason if the valve is leaking the pump will cycle.  It was leaking so I think I'll take care of that before trying to tear the pump down for rework.

[Ken Juul]

I replaced the diaphram in mine to stop the cycling.  Couple years ago, got the parts at West Marine, think the cost was about $15, easy fix.