Jay and I were out hunting night before last, and were having motor issues. We would run WOT, and after about 2 minutes the motor would stumble. If we pumped the prime bulb on the fuel line, the motor would get more fuel and the problem would go away. I figured the fuel filter must be clogged, so I took it out and blew through it backwards and a ton of junk came out. Yesterday we bought a new filter before we headed out, and once we got running on the lake we had the same problem. My next guess was the fuel pump. The motor is a 25hp kohler, and has the mechanical fuel pump built into the valve cover. I removed the pump this morning, and it creates suction at the inlet, but I'm not sure if it pulls as much as a new pump. I then decided to check for water and crud in the float bowl. There were a couple drops of water in the bottom, but not near enough to cause any trouble. The only other thing I can think of is replacing the hose because there are some wear spots where it could possibly be sucking in some air. Does anyone have any other thoughts on what to check? The carb in general looked pretty clean, and I couldn't see any clogs in the holes I checked.