Float Needle Valve

[LynnC7738@aol.com]

I'm having trouble getting the needle valve that's operated by the float to 
seat. I've put in a new seat, and a new float, on the advice of my mechanic, 
but I'm still getting fuel dripping into the intake. This is only happening 
on the back carb   which is a Zenith , on my Series I Alpine. Of course it 
results in flooding. Has  anyone had a similar problem? I've "addjusted" the 
float by bending the   tab that the needle  hangs from but it still leaks. 
Ideas?
Lynn
Series I