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Normally, I would closely inspect all of the external fuel lines first. They are the most prone to cracking and leaking, especially around and underneath the clamps. Next, I would check the petcock (Fuel "Tap"), as this is easily inspected without removing any parts. Most start to show their age by first leaking as you move the lever in any way (from "off" to "on", or to "reserve"). Use a flashlight (I recommend an LED type as they are not so hot) to watch the area around the lever as you move it to see if any drops or weeping occurs. Another place to look is the face of the petcock where it is bolted to the bottom of the tank. I have had gaskets go bad there, and start leaking. Sometimes you can just tighten up the bolts and the leak will stop.
If everything looks good, you may have a sticky float valve, or junk in one of the carbs that is allowing the bowl to over fill and run out the overflow. This repair will require you to remove the entire carb bank, and remove the bowls.
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