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.

Step 1

Unplug the cords on the switch and the pump motor from the electric outlet.

Step 2

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

Step 3

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

Step 4

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

Step 5

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

Step 6

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

Step 7

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.

Step 8

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

Step 9

Screw the discharge pipe to the new pump.

Step 10

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

Step 11

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

Step 12

Reconnect the vent pipe.

Step 13

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.)

Step 14

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

Step 15

Tighten the lid bolts with a socket or adjustable wrench.

Step 16

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

Step 17

Tighten the clamps while holding the check valve in place.

Step 18

Plug the cords into electric outlets.

Things You Will Need

  • Pipe wrench
  • Socket or adjustable wrench
  • Channel lock pliers
  • Teflon tape


  • 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.

About the Author

Richard Daub is a professional journalist based in New York City and the author of three books: "Pork Chops and Subway Cars" (a collection of essays); "Above the Glamour" (a biography); and "Circle in the Weeds" (a novel). More about Daub and his work can be found on his website, www.RichardDaub.com.

Photo Credits

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