ok I bought this off ebay..its a 68' 6 hp evinrude..that the guy says has a new impeller but does not pump any water out...he ran it long enought to see it idel right and up and down on the throttle..but still no water..any ideals what it could be..he suggested the water system was clogged..but had not actuall checked..yea he should have not done that.but he did it anyway...I dont have a service manuel looks like I might ahve to get one after all..if its not the impeller..where do I need to look??? huntertn... the model is 6802r-E13755...