42 H won't start

Here goes, I'll try to keep it short.

After 9 years of mowing with my 42 farmall H with no problems, she decides not to start this week.
Gas is now leaking from the air filter tube running from the carb to the air cleaner.
Time for a tune up? Changed plugs, cap and rotor, set new points at .020. No help. Disassembled carburetor and cleaned everything, checked float for holes, checked gas flow to carb,Checked needle valve function, cleaned fuel filter screen. Plugs are sparking, but dry after trying to start. I have not moved any of the adjustment screws on the carb, as it ran fine last week. I am about out of ideas, without starting to guess.

Anyone have any ideas what to try next.

Thanks in advance, Roger B. Near Cincinnati

Although I don't know why the old H would not start in the first place, After a tune up and thorough carburetor cleaning, (and many other things) and float adjustment, timing check, best I could anyway, and 6 or 8 hrs. kinda wasted, It started right up, uhhhh, well you know, uhhh, fired right up I'm talkin'..... .....

AFTER I PUT THE PLUG WIRES BACK ON THE DISTRIBUTOR IN THE RIGHT ORDER.....

Sorry, I'm so embarassed.

Thanks to all, what a good forum.

Gordo SD, I checked and adjusted the float tonight but ran short on time, and didn't try to start it as is was 10:30pm here and time to close up shop. The needle valve was cutting off the gas flow when I was testing it manually. I did lightly tap then needle just in case. Also, I do always shut the gas off. Thank you for your input.

Jossette, I did check the choke function, and it is working properly, Thank you for the advise.

I will let you now if the float adjustment works tomorrow, if not I'll look into the timing.

Thanks to you all, your time and input is very much appreciated.

Roger B. Near Cincinnati

Gordo