I do not use a pump or regulator. Fixing the original is not too hard but does require some time and skill to do a good job. Buying a good OS, Jett, or Perry carb is easier plus it can be used on many different engines, plus you can sell them for nearly as much as they cost. Remember that the carb size and rpm will make the difference between an engine that you will love or one that you hate. Smaller carb and more rpm is always better for reliability.