Observe the sump pump during operation to determine which PVC pipe connection is not secure.
Unplug the sump pump. Pull apart the faulty PVC connection. Inspect the pipe and connector to ensure there is no damage. Dry the pipe and connector with a soft cloth.
Apply PVC cleaner to the outside of the pipe and the inside of the connector with a 1-inch paintbrush. Allow the cleaner to dry for one hour.
Apply PVC solvent to the portion of the pipe that fits into the connector, as well as to the inside of the connector with a 1-inch paintbrush. Fit the pipe end into the connector. Allow the solvent to bond for one hour.
Plug in the sump pump. Fill the well with water until the pump kicks on to test for leaks.