[fred cook]

If you have access to the outside of the block wall, dig a ditch and install a french drain. Also, while the ditch is open, clean the outside of the wall and apply a good sealant. Most of the time sealant works much better when applied on the outside of a wall rather than on the inside! Your other option would be to install a second sump pump right where you think the water is coming in and pump it to an outside location. The other thing that I would do is to make sure that all of the water is turned off in the house and then go check the water meter. If it is running then there is a leak between the meter and the house. Good luck!