Polish the tapered end of the screw with some metal polish and put it back. If there's any slight nicks or marks the polishing should help remove them. If it's still leaking, take it out again and bang a cork or similar into the hole to seal it. Don't ride it like that but leave the fuel turned on for a bit. If you're still getting a leak it's the overflow and you'll have to have a look at the float valve. It doesn't need much to stop the float valve from sealing.
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