Odd filter pressure behavior

Neemer

Gold Supporter
Oct 10, 2017
178
Mid-Atlantic
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

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
20,317
Laughlin, NV
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.
 
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