HELP: Well pipe foundation sleeve leaking

[Lowrider25]

I recently purchased a new home with a stone foundation. The well pipe and wiring is sleeved through the foundation inside a 3" PVC pipe. All summer we had heavy rains and no water infiltration, however recently we got 16" snow that was followed by 3" rain. I went down to the basement to discover 8" of water in the basement (the sump pump failed as well). I found that I have a very steady flow of water entering into the basement via inside the 3" sleeve, enough to fill a 5 gallon bucket in about three minutes. I have replaced the sump pump and have set-up a gutter system to collect the incoming water and divert it to the sump hole.
I expect that there is a crack in the sleeve that leads to the well and I may have to dig up the sleeve to replace it. I shut down the well pump and drained the pressure tank, waited for ten minutes and no drop in water flow, so I know it is not a leak in the service pipe from the well. Can only be ground water.

However I was wondering if I install a rubber Fernco fitting to reduce the opening from 3" down to the well water pipe if:

1. that would stop the water from entering the house and
2. should i worry about the pipe filling up and dumping ground water into my well at the other end of the chase
3. can the wiring from the house to the well pump by submerged in water in the sleeve?

The other option I have considered is to fill the end of the sleeve with hydraulic cement. That way I don't have to worry about disassembling my well pipe or wiring to install the Fernco fitting.



Let me know your thoughts, Thanks.