Ran my boat the first time this summer a couple weeks ago for a short time..ran fine. Took it out the next weekend and after running and idling the boat for about 20 minutes, the Holley Blue pump that's about 15 years old got real hot and stopped pumping. Poured cold water on it a few times and finally made it back to the ramp. Replaced the Holley Blue last week with another Holley Blue, did not change the regulator. Took the boat out yestereday and the same thing happened..exchanged the Holley for another Holley Blue, did not put a new regulator on. Ran today the same thing happened. Pump got hot to touch...waited cooled it down with water and runs fine for a while..then gets hot again. I do not have water in the tanks..filter is clean..get a constant 12.5 volts to the pump. It is also on a seperate switch which is good...can't figure out the problem..thanks..