I have a kohler 5e genset on my Four Winns 278 Vista. I got some debris in the strainer and fried the impeller. It was intact when I pulled the impeller so no vanes were lost. We replaced the impeller and when I restarted the genny hardly any water was coming out and then nothing at all frying another impeller. Starting at the through hull valve I checked everything for blockage. I found a clump of something in the hose from the strainer to the pump. It also looked like it was failing on the inside so I bought enough hose to replace all the hoses from the through hull to the pump. New impeller, checked the gear was still turning the impeller, closed up the pump, primed the pump and filled the hoses. Got no water flow and immediately fried the impeller. At 15 years old I decided to replace the pump and again checked for a block and everything is clear. Started the genny and again no water at all. So the old pump probably wasn't the problem but I am at a loss as to where the problem is. Any one have a suggestion? Thank you in advance!