Thanks to all,i have used another pump which i had spare and all is well! However i would like to keep the existing pump as a spare and so need to know what,if anything,can be done to get this pump up and running as it was.
I dont use any controllers or cut off switches so it is a simple setup(Pump and battery)
The thing i need to know is,do pumps "fail" over time and become less efficient.I had been told,in the past,that they either work or they dont,but now i am not so sure.As i have previously stated i did change the pressure switch but no improvement.