Hurlcon Suction Air Leak / Cavitation

Pump loses prime after a few minutes of running and then sucks air.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Cracked suction union on Hurlcon pump, Perished pump lid O-ring, Loose threaded fittings, Suction line leak above water level

Safety: Turn off pump before tightening or removing any fittings.

Inspect lid seal: Clean and lubricate the pump lid O-ring and ensure the lid is tightened evenly.
Check unions: Hand-tighten the suction and discharge unions on the Hurlcon pump. Do not overtighten with tools.
Soap test: With the pump running, apply soapy water to joints on the suction side. Bubbles being sucked in indicate an air leak.

Persistent air leaks in underground suction lines require a pool plumber to locate and repair.

Medium 3/5

Hurlcon pump suction union and lid O-ring

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