A sump pump airlock is a situation where air becomes trapped within the pump or discharge pipe, preventing the pump from priming and effectively moving water. It's essentially a bubble of air that blocks the flow of water, hindering the pump's ability to function.
Here's a breakdown:
- The Problem: When air is trapped, the pump struggles to create the necessary suction to draw water in. It ends up spinning without pumping, which can even damage the pump motor over time.
- Why it Happens: Airlocks often occur after the pump has been inactive for a while or when the water level in the sump pit is very low. The pump may draw in air instead of water, leading to the airlock.
- Identification: You'll typically notice an airlock when the pump runs but doesn't seem to be moving any water. It may also make unusual noises.
How to Prevent or Fix a Sump Pump Airlock:
While the provided reference only mentions adding a discharge in the pump itself as an airlock prevention tip, here are some other common methods:
- Check Valve: A check valve installed in the discharge pipe prevents water from flowing back into the sump pit when the pump shuts off. This helps keep the pump primed and reduces the chance of an airlock. Ensure the check valve is functioning correctly.
- Bleeder Valve: Installing a small bleeder valve or a small hole in the discharge pipe just above the pump allows air to escape, preventing air from getting trapped.
- Manual Priming: Some pumps can be manually primed by pouring water into the pump housing to displace the air.
- Adjust the Float Switch: Ensure the float switch is positioned correctly and moves freely. A malfunctioning float switch can cause the pump to run dry, leading to airlocks.
In summary, a sump pump airlock is a frustrating issue that prevents your pump from working efficiently. Implementing preventative measures and knowing how to troubleshoot an airlock will keep your basement dry.
