"I have a 1972 Gamefisher 217.59450 with what appears to be a carb problem. The engine appears to run a little lean, a little hard to start but then runs great for about 2 minutes then dies. If I pump up the bulb (which is firm) and force a little more fuel into the carb it will keep running. If I let it die and then pull the carb it appears to have plenty of fuel in it. I have put a carb kit in it and tried many float level settings and no change. The fuel pump element is installed at the recommended 45 degree angle. Any ideas?"