I am not sure if I need a new water pump or not on my 1976 35 hp Johnson. When I used the flusher on idle, water came out the exhaust up high. Then I put it in a trash can and started it and nothing happened. The water is above the lower unit and pee holes, so I wonder if it needs replaced or if I have a little to much water in the can. If needing replaced, is it a job for a novice with a manual and would I need any special tools to fix it. Any suggestions are welcome. Thanks.