Luckily my pool has been flawless since I joined up here last year, this thread is concerning my sisters pool. They don't keep up with things and it becomes my job to fix it.
The short, pump only draws about half the amount of water it should, and overtime starts to run dry and loses prime.
I'll have to give equipment specifics later, but essentially it's a 23,000 gallon inground with associated Hayward pump and de filter. Very simple old school plumbing with only one line coming out of ground from 2 skimmers and a main drain. No valves above ground. Comes out filter one line back into ground to 2 return jets.
I'm guessing suction side leak. I hooked up a temporary line to pump into pool to bypass any underground stuff and it still is having the problem. Basically it's got to be at the pump and everything there looks good. Pump sounds fine running. How can I tell if maybe I just need a new pump or what is causing it to not pull water. Only fills the pump under the lid maybe halfway then will stop pulling all together.