How to Replace an Ejector Pump


An ejector pump is a plumbing device that pumps dirty water from a household plumbing system into a septic tank or sewer. Typical ejector pumps are powered with an electric motor ranging from 1/3 to 1/2 horsepower, and are installed in a dedicated ejector pit on the property. New ejector pumps can usually be found at hardware or plumbing supply stores.

Things You'll Need

  • Pipe wrench
  • Socket or adjustable wrench
  • Channel lock pliers
  • Teflon tape
  • Unplug the cords on the switch and the pump motor from the electric outlet.

  • Loosen the fastened clamps on the check valve secured to the discharge pipe, using a socket wrench or adjustable wrench.

  • Disengage the check valve by hand after the clamps are loosened.

  • Remove the ejector pit lid by loosening the bolts with a wrench. Place the lid off to the side.

  • Disconnect the vent pipe by pulling it off by hand. If it is stuck, try twisting it loose.

  • Grasp the discharge pipe and lift the old pump out of the ejector pit.

  • Unscrew the discharge pipe attached to the old pump. If the pipe and fastenings are still in good condition, they can be reused with the new pump.

  • Wrap Teflon tape to the screw threads for the discharge pipe. This will help create a stronger seal.

  • Screw the discharge pipe to the new pump.

  • Lift the new pump by the discharge pipe and place it into the ejector pit.

  • Align the discharge pipe to the main pipe and attach it to the fittings where they were connected earlier.

  • Reconnect the vent pipe.

  • Cover the ejector pit partially with the lid, but do not fasten the bolts. (Leave it partially uncovered so that you can reach in and extract the cords.)

  • Extract the cords from the pump in the pit by lifting the lid and pulling the cords through the slot.

  • Tighten the lid bolts with a socket or adjustable wrench.

  • Reconnect the check valve and align with the clamp that will hold it in place.

  • Tighten the clamps while holding the check valve in place.

  • Plug the cords into electric outlets.

Tips & Warnings

  • When unbolting the ejector pit lid, you may discover that the rubber seal of the lid is too damaged to re-use, so it might be wise to install a new one.
  • During the installation process for the new pump, check the pipe connections to make sure they are snug. It is important for the pump to operate in a vacuum in order to effectively extract the used water from the house and into the ejector pit--a connection that is not snug can cause a leak.

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