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Leaking SUs 120-130

I'm having a problem with my '64 220 and I would like some help. I've tried everything I can think of. From time to time fuel is coming out of the vent holes in the float bowls of the SU carbs. When the valve was replaced in the front carb, fuel started coming out of the vent hole on the back carb. That seemed to fix the problem. A couple of hours later the front carb started leaking again. The floats seem fine and everything is clean, no crud in the bottoms of the bowls. I have replaced the flexible fuel lines, replaced the filter before the pump and added a filter after the pump. I finally replaced the fuel pump. It is better, but at an idle it will sometimes begin leaking. Also, after shutoff a small amount of fuel will seep out of the vent hole. What do I try next?






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