How can i fix the fuel leaking from the priming cap?

I have a Victa 2 stroke sports 1600cc electronic ignition mower. One day I accidentally broke the jet by overtightening it.I bought a new jetscrew,a new o ring and a new needle and assembled the whole thing (the ponty end of the needle inside and the round end on top of the float) but the fuel still leaks out as soon as iturn the fuel knob on on. i donot know what I am doing wrong. Iwould appreciate if you could please explain to me how to position the float and needle and the orientation of the horizontal line on the cap. thanks