Hi, I have a fluid art challenger system running against our pond. I
suspect I have a vacuum leak somewhere since the pump starves for
water after about 10-12hrs. Any pointers on how one can diagnose the
problem? No apparent water leaks while the system is running.

TIA

Welcome to rpm.

I have no real wisdom for you. You can try some water on the supply
side joints and see if it gets pulled in. You could also have the
pump pull directly from the pond to see if the unit itself leaks. Do
you see bubbles where the water exits the return?

Jim

Are you sure that the supply line isn't getting clogged/blocked by
something? How soon after the pump has one of these episodes does it
"bounce back" and work properly again?

Dave

I think you should not experiment with the things like this on your own, better take it to the pro..