I picked this system up used and got around to checking it out yesterday... Hooked the motor up and it sounded funny...
Pulled the small pump cover off and the impeller is toast... It was actually like chewed bubble gum, Found a repair kit on line for fairly cheap. Like $20 for two impellers. Not sure if the cheap aftermarket replacement impellers can hold up to the much hotter temps of a race car however. These pumps are pretty much cheap garden or bilge pumps.