Waterway Loss of Prime / Air Leak on Suction Side

Waterway pool pump runs but there is no water flow; the pump basket does not fill with water.

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Possible Causes

Pump lid o-ring damaged or dry, Low pool water level drawing air through skimmer, Loose unions on suction plumbing, Cracked suction fitting at pump housing

How to Fix / Troubleshooting

Safety: Turn off the pump before opening the lid or plumbing. Do not run the pump dry for more than a minute.

  • Check water level: Ensure the pool water level is at least halfway up the skimmer opening so the skimmer does not suck air.
  • Inspect lid o-ring: Remove the Waterway pump lid, clean the o-ring and sealing surface, and apply a thin coat of silicone-based lubricant. Replace the o-ring if cracked or flattened.
  • Check suction unions: Tighten the union nuts on the suction side of the pump. Look for hairline cracks in the fittings or pump housing.
  • Prime the pump: Fill the pump strainer pot completely with water, reinstall the lid, open all valves, and start the pump. It may take 1–3 minutes to fully prime.
  • Observe for air leaks: While running, look for air bubbles under the lid or in the return jets. Persistent air indicates a suction leak that may require replacing fittings or the pump housing.
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Repair Difficulty

Easy 2/5

Required Part

Pump Lid O-Ring
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