Bad Luck. Honestly, sometimes it happens - I have learned this hard way - sometime if you put the needle back in and don't physically moved the float up and down, it won't release (maybe the needle has some junk on it or whatever). you can try to tap the bowl but I have never had any luck. when I clean a carb, I spray the needle with carb cleaner, attach it to the float and install it and then move the float up and down - I put a little shot of carb cleaner on the needle and then button the carb up. the float can stick open too for the same reasons.