Pool Pump Not Priming
A pump primes by evacuating air from the suction line and filling the basket with water. When it will not prime, either air is getting in where it should not, or water cannot get in at all.
Likely Causes
Water level too low
If the water sits at or below the middle of the skimmer opening, the skimmer gulps air and the pump cannot hold prime. This is the single most common cause during Bakersfield summers.
Pump lid o-ring or cracked lid
A hardened, flattened or dry o-ring lets air in continuously. So does a hairline crack in the lid or a lid not seated squarely.
Clogged skimmer or pump basket
A basket packed with leaves starves the impeller. The pump may prime slowly, then lose it under load.
Clogged impeller
Debris past the basket wraps the impeller vanes and dramatically reduces suction.
Air leak at unions, drain plugs or valves
Threaded fittings and drain plugs at the pad are frequent suction-side leak points, especially after a prior repair.
Valve closed or partially closed
A diverter left in the wrong position after service can cut the suction line entirely.
What You Can Safely Check
- Confirm water level is at least halfway up the skimmer opening
- Empty the skimmer and pump baskets and check for cracks
- Look at the pump lid: is the o-ring flat, dry or displaced?
- Watch the basket while running — visible swirling air means a suction-side leak
- Verify all valves are in their normal positions
- Check for wet spots at the equipment pad
When to Call a Professional
If the pump still will not prime after checking water level, baskets and lid, the leak is likely at a fitting, seal or underground line — or the impeller is obstructed. Running a pump dry damages the shaft seal quickly, so shut it off and call us.
Safety: Do not open a pressurized filter or pump housing, and shut power off at the breaker before removing lids on a running system.