Last fall I put away my 88' Evinrude 25hp in good running condition. Last year I had put in a new thermostat and impeller and had no issues all year. When I pulled it out the other day, it would not suck water up. I blew air through the system and it doesn't seem to have any clogs. I then pulled off the lower unit and the impeller was still in tact. (in very rough shape due to running without getting water). Does anybody have any thoughts on why water is not getting pulled up into the impeller housing? I am holding off on ordering the new parts until I can address the issue at hand and see what other parts I may need. Any help would be appreciated!