Power Off: Ensure the pump is disconnected from the power source before touching any internal components.
Check the Foot Valve: If your suction pipe is long, ensure there is a foot valve (one-way check valve) at the bottom of the pipe. This prevents water from draining back into the well or tank once the pump stops.
On the top of the pump casing (the "volute"), you will typically find a small hex-head or plastic screw-on plug. This is the priming port.
Use a pliers to unscrew the plug.
Some pumps may also have a separate air vent plug; if so, open that as well to allow air to escape as you add water.
Slowly pour clean water into the priming port.
The Goal: You are filling the internal "trap" or chamber of the pump. In a self-priming model, you only need to fill the pump body itself, not necessarily the entire suction line (though filling the line helps speed up the process).
Wait for Bubbles: As you fill, air will gurgle out. Wait a few seconds for the water level to settle and keep topping it off until the water stays level at the top of the hole.
Replace the priming plug and tighten it firmly.
Note: If the seal is loose, the pump will suck in air instead of water, and the prime will fail (this is known as an air lock).
Open a discharge valve or faucet downstream to allow air to be pushed out of the pipes.
Turn the power on.
The "Self-Priming" Phase: You will hear the pump motor humming and perhaps some splashing inside. The pump is now mixing the water you poured in with air from the suction pipe to create a vacuum.
This can take anywhere from 30 seconds to 5 minutes depending on the length and depth of your suction pipe.
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