i have a 1971 50hp johnson outboard engine. the problem i am having is that the top carburetor keeps flooding. i have taken it apart and cleaned it thouroghly and have put in a kit. when i turn it upside down and blow into the fuel inlet the float and needle valve appear to work just fine. but when i squeeze the primer bulb fuel shoots out of the tube and into the throat of the carburetor. the primer bulb never gets hard. any help or advice would be greatly appriecated.