I have a boat with a 6.2 liter with Bravo 1 outdrive. Hooked up water to test before going to lake but no water was entering the boat once started. Assumed the impellor was bad even through it was only a few months old. When I took it apart the impellor didn't look that bad. Took thermostat and tested it and it opened. I hooked up the water with raw water pump out to test for flow and their was none. Is that normal? Shouldn't their be flow even if thermostat was cold? The engine wasn't started during the final test. Should I replace the impellor and try again. With a hose hooked up to outdrive with impellor out shouldn't water flow into boat?