I have a 1978 7.5hp Mercury. I replaced the impeller and took it on the lake. Now it will only pump water when I am running it at least 1/2 throttle. Any lower and it stops pumping water. It used to do just fine for trolling but now I'll over heat.
Any suggestions on what might be...
Hopefully someone out there can help me with this problem. I just changed the impeller in my 1978 7.5 Mercury outboard. Now it still won't push water. The key is in place, the fins are facing the right direction, the tube is clear, etc. I have taken the lower unit off, checked it, and...
