Odd filter pressure behavior

[Neemer]

I’ve noted this for quite a while, but I don’t understand it. My filter pressure will actually decrease over time. For example, when the pump first turns on, the pressure will be 15 psi. A few hours later it will be 12 psi. This runs counter to my understanding of how these things work.

 

[mknauss]

Filter pressure lowering like that typically means the pump is either starved for water on the suction side or has a suction side air leak.

 

[Neemer]

Thanks Marty. That was very helpful. I was able to improve things after understanding the potential cause.