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What would cause the carburetor to overflow? The car is a rebuilt and only does it maybe once a week. New inline filter, new gas tank
 

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Jiggle the handle.........:sign0020:

You probably have some lose debris, that got under the needle and seat. Your going to have to dissemble the carburetor to find it.
 

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Float adjusted wrong, bad needle valve, dirt at needle valve.

When the bowl fills it raises the float and a needle valve closes off the incoming supply, yep just like the toilet.
 

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Float adjusted wrong; bad float (it maybe taking on fuel, which makes it heavy and then it sinks instead of floats); a bad needle valve tip; dirt at needle valve holding it open; the wire retainer on the needle is holding the needle out of position causing the carb to overflow (throw that wire retainer away).

When the bowl fills it raises the float and a needle valve closes off the incoming supply, yep just like the toilet.
DITTO, To all of the above!!!!!!
 
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