Help with ballast problem please.

Greetings all,

I have an 07 MB B52V23 and I have a problem with the drivers side ballast.

The pump spins and the impeller is fine but the tank isn't filling with water. Today I removed both check valves and they are operating properly. I also was able to blow through the hoses and found no obstructions. I am really out of ideas.

I did find one small hole in the hose that runs from the pump to the tank. I removed the hose and plugged one end. Blowing through the other end I was able to feel air escaping from the hole. Would this small hole be enough to cause the tank not to fill by allowing air into the line?

I did cut the hose back past the hole and reinstalled it but I wont be able to get it in the water until next weekend.

Any other thoughts?