i have a 1974 evinrude 50 hp that i recently acquired. got her on the boat and started her up in the driveway in a tank of water with a hose running in it. she idled excellent for the 5 minutes she was running before i decided to shut her down. the reason for this is... there was no water coming from the tell tale.. on my 33 hp it would shoot water from the telltale the second you fired it up and until you shut it down. i was reading on a site that this motor has "auto pressure temp control, warning buzzer" so does it wait until it gets to a certain temp before it starts pushing water?? or??? i already have plans to get a new impellar/water pump ASAP as i know it wont hurt having a new one. i dont want to run it if its not going to cool properly. btw.. the model number is 50473M.. thanks again for any input.. it has a different cowl on it.. i have the original but the seal on it is bad.