Again, how old is the house?
Hydraulic cement will stop leaks within
3 minutes of putting it in.
I have an older home, I have had a few cracks
that weeped and leaked water, mixed up some hydraulic cement (also called Fast Plug) drilled out the area and pushed the stuff in... leaking/weeping always stopped immediately..even if water was leaking in
Buy it at hardware store or Lowe's/Home Deep...