Pump Won’t Prime? Here’s What to Do
First: What Does “Priming” Mean?
Priming is the process of filling your pump with water so it can begin pulling water from the pool and pushing it through the filter. Without a full prime, your pump runs dry—and a dry-running pump can overheat and cause permanent damage in just minutes.
If you turn on the system and hear gurgling, notice little or no water movement in the pump basket, or see bubbles in the return jets, your pump may be struggling to prime.
What Causes a Pump to Lose Prime?
Several common issues can prevent proper priming:
1. Air Leaks
If air is getting into the suction line, it breaks the vacuum seal. Look for:
- Cracks in the pump lid or loose O-rings
- Leaky unions or valve fittings
- Faulty drain plugs or gaskets
2. Low Water Level
If your pool’s waterline falls below the skimmer, air enters the system. Always ensure the water covers at least halfway up the skimmer opening.
3. Clogged or Blocked Lines
Debris in the skimmer basket, pump strainer, or suction line can restrict water flow and stop priming.
4. Dirty or Damaged Pump Lid
A fogged or cracked lid can hide issues or cause vacuum loss. The lid’s O-ring also needs regular lubrication and inspection.
5. Pump Height or Location
If the pump sits too far above the pool’s water level or has an unusually long suction line, priming may become difficult without a check valve or modified plumbing.
What You Can Try
Before calling for service, you can:
- Turn off the pump to avoid dry-running.
- Fill the pump basket with water, reseal the lid, and try restarting.
- Check all lids, gaskets, and drain plugs for tightness and wear.
- Remove and clean all baskets—including skimmer and pump strainer.
If the pump still won’t hold prime, it’s time for professional troubleshooting.
How Heritage Pools Resolves It
We don’t guess—we diagnose. Our repair specialists thoroughly inspect:
- Suction-side plumbing for air leaks
- Pump lid, gaskets, and housing integrity
- Filter and valve positioning
- System pressure, backflow, and water levels
- Appropriate equipment sizing and installation design
We service all pool types—Concrete, Fiberglass, I-Beam—and can make precise adjustments or replacements to restore proper function.
