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water pump issue

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Tom Pickett:
hi everyone
    i installed a new water pump had been damaged because the shop that winterized it did not get all the water out.
  The issue when the pump is on we are not getting full pressure getting air in the system.
  no leaks system works fine on city water. I believe there is a problem with a swain valve. I have not found and cracks in the pex tubing.
  What do you think
Thanks
Tom

Fred Brooks:
   Hi Tom,
   Sometimes when a water pump is changed, there is air in the supply lines as well as in the pump itself. When the pump is turned on it cannot create water pressure because the pump is "cavitating". To eliminate the cavitation issue, loosen the water line on the "OUTPUT" side of the pump. Turn on the pump. You will hear it start to build pressure and leak water at the loose fitting. Tighten the output fitting and the pump will build pressure and then shut off. Hope this helps, Fred

Eric Maclean Co-Admin:
Tom
If your unit has a winterizing valve set up to draw antifreeze into the system it's possible it was left in the winterizing position and the pump is simply just sucking air .

Eric

Tom Pickett:
Hi everyone
   Eric yes my coach has a winterizing switch. The switch is in the normal position. pump is cavitating, anybody have this issue. Ifo believe it has something to do with swain valve but cannot find any info about it.
  Thankyou for all your help so far
   tom

Scott Shearer:
Tom,

Assuming that your 2008 PT like our 2006 PT and has a gravity fill for the freshwater tank and a hose reel for city water. I don’t believe that there is a Swan Quick-Fill valve installed.

There is a check valve that prevents stored water from back feeding when the water pump is in use. I’ve included an image below. From my experience with our PT, when this check valve fails water will leak out of the hose reel connector.

If your coach has an auto-fill function via the Aladdin system, it is possible that the Red Hat electric valve is allowing air to enter the system.

 Another place to look, if your coach has the Prevent-a-Freeze winterization system, the changeover valve could be allowing air to enter the system. On our coach, the Prevent-a-Freeze changeover valve is mounted on the forward bulkhead above the Aqua-Hot.

-Scott

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