Turn off the electric supply for the sump pump. Locate the power cord for the pump and unplug it from the circuit.
Bail out as much water as you can from the bottom of the sump pit, if present. This will help make working around the pit easier.
Locate the sump pump hose. Installations differ, but typically a flexible hose is connected to the outlet on the pump, while the other end connects to a rigid drainpipe.
Loosen the hose clamp on the end of the hose that's connected to the sump pump. Pull the hose off the pump. Disconnect the other end of the hose from the union or coupling that's connected to the drainpipe. Use a pair of pliers or a wrench, if needed.
Connect the end of a new hose to the outlet on the pump. Secure it with a hose clamp. Connect the other end of the hose to the union or coupling on the drainpipe. Tighten it with pliers or a wrench. If necessary, install additional coupling hardware or adapters to connect the sump drain hose.
Reconnect the sump pump to the electrical supply by plugging it back into the socket.
Run a test when the sump pump well is full again. You can also fill the sump well manually with a garden hose. Watch the hose for leaks. Tighten the clamps or couplings, if needed.