Sprinkler Pump Pressure Loss: Check Impeller and Suction Leaks

Diagnosing Gradual Pressure Drop in a Pond-Fed Sprinkler Pump

Pressure fallen off, heads don't fully pop. Added heads earlier—no immediate effect. Suction screen clear. No visible leaks. Pump seal? Check valve? Dirt in heads after pipe repair.

Top Suspects

1. Pump seal (shaft seal) – Sucks air, loses prime/pressure.
2. Impeller clogged or worn – Even tiny debris reduces flow. Disassemble and inspect.
3. Tiny suction leak – Major pressure killer. Check all fittings, glue joints, foot valve.

Shell in Valve

Previous shell in valve mechanism suggests debris in system. Impeller likely has buildup.

Action

Pull pump, inspect impeller and seal. Pressure-test suction line. Rebuild or replace pump if worn.