Originally Posted by boating2go
The pump for the sinks and shower
will start on its on and keep running until you shut it off. Do you think if I place a small tank before the pump to help the pump hold a prime it would solve this problem?
This defies my long held belief in the KISS principle. If the pump is air locking then it needs to be fractionally lower and closer to the tank from which it is pumping but if it keeps pumping when there is pressure in the output side then the pressure sensor switch has failed.
Most pumps have a self priming height documented on them but I prefer to keep my pumps fractionally below the height of the tank pickup so they are always primed.
Putting a header tank in will only help till you get air in that tank also, then you'll have the same problem again and much harder to re-prime.
Edit: if it is air locking then there is air getting into the input side which needs to be investigated, as if air can get in, then water can probably get out too.
Second edit: oops,yeah, don,t forget to check for leaks
on the output side but normally they would appear as the pump cycling on and off not running continuously unless it was a very big leak, and a leak that big usually shows up in some horrid way.