Have 22' Concord powerboat, 260hp 350 Mercruiser, 1989. Had new impeller installed, have however have started apx 5x without water for apx 5 sec per time. Overheating after top speed, seems to be on one side of thru the hull exhaust. Wondering if I smoked the new impeller, or if the water pump on the engine is going, or if possibly some type of obstruction in system, boat sat up for 3 yrs before I got, only 200 hrs total though. Please advise. Eric
