water pump issue

[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