Yes what old66tiger says is true about the return line. Just make one and be done with it. I run 6 carbs and the return line solved a lot of problems. You can fab one up really quick with some cheap rubber fuel line, a carb jet shoved in there, run it to the tank breather and see if it works. If it does then make more permanent mods with better routing, stainless braided line, whatever you want. I tried insulation only at first too but that didn't solve the problem.
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