YOu can rebuild the carbs. I never did anything like that and did it on my 20 evinrude. THe guy who said squeeze the bulb is right. If you get the boat going at high rpm a bad fuel system with a leak somewhere will compensate but as soon as the fuel pump is not pushing hard you can lose your prime. With mine it was after running and then stopping to fish I could not start it without repriming. Found the leak at the carb, rebuilt the fuel pump and carb. easy take pictures, check out youtube.