As you may already know, there is a timeout for the pump so that if there is a leak, the pump will eventually stop running. However, it is possible that the pump has been damaged from constant abuse.

As for the fuses, have you been using the correct fuse?

Finally, I have to ask why you don't fix the leak or at least plug it? It should be easy to get to.

A new pump is $228 from FastLane.

Good luck.