Aftermarket?
It sounds like you may have an aftermarket pump. Do you still have the water sensor connected?
These boats, because we can't easily monitor the engine compartment, came with a water sensor, that is mounted along side the pump. It's suppose to come on 10 seconds after it comes in contact with water. Then, after the pump has drained the boat, the sensor is designed to go off after 30 seconds.
You can visit our parts warehouse at the top right hand side of the forums header, then choose your boat, go to speedster electrical accessories and you'll see the mount bracket and water sensor.
I have the 97 Challenger. My shaft seal was leaking by just a bit and I didn't notice that my sensor wasn't working until I saw the swim platform underwater. I fixed it and test it regularly now............:cheers: