Losing prime

[Cam]

What happened to me personally, my fuel pump diaphragm split and kept flooding the engine. Sort of the same symptoms you have. Once the daiphragm broke, it kept flooding the cylinders when I pumped up the ball. Take off the cowl and while pumping the ball, watch to see if fuel is pouring through. When this happened to me, ball would not get hard after pumping it up. If this is the case, you will need a new fuel pump. Unfortunately, big $$$$. Good luck and keep us posted.