Hayward Suction-Side Air Leak

Pump loses prime repeatedly after running for a while.

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Safety Warning

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.

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Possible Causes

Cracked suction fittings, Loose union at pump inlet, Worn pump lid O-ring, Leaking valve stem on suction valve

How to Fix / Troubleshooting

Safety first: Turn off power before tightening or disassembling plumbing.

  • Inspect pump lid and unions: Check the lid O-ring and inlet union for cracks or flattening. Replace O-rings and gaskets as needed.
  • Use soapy water test: With the pump running, carefully apply soapy water to suspected joints on the suction side. Bubbles being drawn in indicate an air leak.
  • Check valves: Inspect suction valves for leaks around the stem or body. Replace valve O-rings or the valve if necessary.
  • Repair cracked fittings: Any visibly cracked PVC fittings or unions should be cut out and replaced, ensuring proper primer and cement are used.
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Repair Difficulty

Medium 3/5

Required Part

Pump Lid O-Ring
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