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Most carburetor fuel systems do not have a return fuel line. If they do it is usually at the fuel pump and would not impact your air/fuel mixture in any way. However your thinking is correct when applied to fuel injected systems, where a blockage in the return line would raise fuel pressure, thus enriching the mixture. As HandyHowie suggested, some ...


The carburetors probably just need their idle mixture adjusting to make the engine run a little leaner. If adjustment doesn't fix it, the carbs may need refurbishing.

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