Have a John Deere line trimmer. S1400, made by homelite. Has been in the garage for years unused because it had cracked fuel lines and other issues. Decided to try and get it running again, for "fun" with my son.

Fuel lines and gas filter have been replaced, they seem tight with no leaks.
New spark plug installed, spark tester used and is showing spark just to be sure
Compression just at or over 90psi which is supposed to be in range.
Using fresh non-ethanol pre-mix 1:50 in a can. The old gas years ago was standard from-the-pump gas manually mixed in a plastic jug that lasted forever (so old, nasty gas) but it ran for years like that
Found a carb kit, soaked in carb cleaner, blew out a couple bits of gunk and rebuilt the carb with the new kit. Carb is C1U-H46 style, kit was RB-82.

I didn't replace the tiny screen as part of the carb rebuild. The old one had some gunk on it that clearly was a problem but I cleaned it out and it looks fine now. There was also a tiny oval welch plug that I also did not replace.

Trimmer won't catch and start, won't even sputter. Leaks a little fuel out the air filter when choked and pull-started 5-10 times (probably flooded at that point I'd assume?)
At one point mid-troubleshooting, it leaked the entire gas contents out overnight, but haven't filled it up completely since then. I'm assuming it must have had some suction or something to drain it completely.

Where should I look next? Maybe the needle isn't seating correctly? Maybe that's why it's leaking too?? Any ideas?