The coupler isn't loose on the shaft, I didn't explain it right.
The coupler and shaft are tight together, it's the coupler/shaft that moves side to side a little (has play in it) in the housing. At first thought you would think the bearings were worn. But I have the pump and shaft out of it so I'm wondering if its loose because of that. The shaft is at the lake so I can't slip it back in to check right now.