Hi wce and Tomkatoz
Firstly, I will say that twice I am reassembled these and somehow jammed the float in a partly downwards position, so maybe thats the problem
As wce has said, I would be looking at the needle or needle seat. First, get a bit of light valve grinding paste (or even a bit of copper anti seize if thats all you have) on a q-tip cotton ear bud and push it up the hole the needle goes up. When it bottoms out, apply light pressure and spin the qtip back and forth. You are lightly lapping the seat and will clear it up.
Then spray out with degreaser and clean cotton bud. Now reassemble without the bowl and apply light pressure to hold the needle valve shut. It should hopefully not be leaking.
These parts are starting to get a bit scarce, I would personally do an order from Bruce at ODK as he still has all the parts.
A needle
https://www.outdoorking-forum.com.au/engines...re-parts/victa-g3-needle-cr03265-cam1739A needle Seat
https://www.outdoorking-forum.com.au/engines...rts/victa-g3-needle-seat-cr03282-cam1740A jet o-ring
https://www.outdoorking-forum.com.au/engines...rts/victa-fuel-tap-o-ring-ha25048-ptc807Bowl gasket
https://www.outdoorking-forum.com.au/engines...ets/victa-g3-carby-bowl-cr03269a-140-063Note the fuel tap oring is same as the jet one.
The jet o ring being perished will mean it sucks air past instead of fuel up the main jet