In addition to the advice offered previously here’s a couple more tips:
If the float needle has a viton (“rubber”) tip make sure it is clean and smooth. If it is not, replace it (the smallest scratch or crack in the viton will cause it to leak).
However if the needle is all metal it may need to be “seated” for it to close leak-tight: Remove the remove the float assembly from throttle body. Turn the throttle body over and place it on a solid surface. Now drop the float needle into it’s seat and give the needle a couple GENTLE taps with a hammer. This will conform the brass seat to the steel needle.
Make sure also there’s nothing fouling the needle seat. The tiniest scrap of Teflon pipe tape or a single bit of hair caught in the seat will make it impossible to seal.
Finally make sure the float fits snugly on the pivot pin without binding - it should not move more than about 1/16” sideways from center. If it does gently squeeze the pivot ears closed as required. Also make sure when installed the float pontoons are centered in the bowl and that they are not rubbing anywhere against the bowl walls.
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