Tale of 3 carbs

My wife fought with these the other day and gave up. She was cooking and baking all day yesterday ( all 4 boys came for supper). I decided to give it a go on carb cleaning. All these go on the Farmall B or A. One carb runs the B fine on 75 percent choke, doesn't smoke, runs up and down the road fine. Had it apart several times, nothing is plugged. Next carb runs the tractor so rich that it pours smoke. No main jet adjustment on it, it's clean and float has been adjusted every way possible. Nothing helps. 3rd card is most puzzling, good and clean, all passages are clear, float is set, not scrubbing on bowl. When you hook gas to it it gurgles, and gas runs out of the main brass jet, and never stops. Verified that float is working by setting top on a glass of water and running water through the inlet. Fills up and stops. Assembly carb and can hear float moving freely in the carb. No idea what the deal is. Final gave up and put a Marvel carb that fits an Allis B on the Farmall B...... Runs perfect! Any advice on the zenith carb collection??

Have swapped tops on the one that gurgles and gas runs out. Still does it. But that top with float works fine on the carb that runs with choke..... Well it doesn't flood. I'm stumped.

remember your elderly friend with the boxful of carbs? Time to start your own box for the next guy.

Something I have found to do on the mystery flooders, before putting the top on, turn it upside down, suck on the inlet fitting and put your tongue over the hole.

If it won't hold vacuum, the needle valve is not sealing.

Modern day carb kits in my opinion mostly have replaceable elements that are seemingly better, but of lesser quality than original components.
For example, the rubber tipped replacement float valve needle. Seems it would be better than the original metal (non-rubber tipped) one, right?? Well, I have had nothing but TROUBLE with these!!!! My experience, they either leak, or stick shut. I have had to discard these, and use original needles to cure the float problems that they create.
If I buy a carb kit, I'm usually just after the gaskets. The rest of the stuff that comes in the box, virtually gets thrown in the trash. The only time any of it gets used, is if something original is missing, or ruined beyond use. So, if your carbs have been overhauled using entire carb kits, have fun with that.
Setting floats is a tad confusing. Are you sure you adjusted them right?? When bending a float for adjustment, the float needs to be adjusted the same direction you want the fuel level to be changed. If fuel level higher, then float needs to be higher. If fuel level lower, then float lower. If your like me, its easy to get turned around and adjust float the wrong way when you are making this adjustment with top part of carb upside down on the work bench.

Throw the zeniths in a box and forget about them. Find another marvel that will fit & use it. I did that with my Super C. A whole lot less hassle. And you know what: the Super C is happy with it and so am I. The only ones who mind appear to be the correct police & they haven't given me a ticket yet.

Clean out idle circuit on the zenith with a .04 drill .

Have you poked out all the passage ways and also the hole in the brass tube that sits at an angle where the venture is? Also while this may sound odd but I have found that sometimes putting a carb in the oven and heating them to around 200 degrees help make it easier to clean them

Put a glass under carb connected to gas line.
That way you can see what's happening if float doesn't shut off gas.
Try it and report back.

George, did that. Float shuts off gas., Until you put carb together. It ain't rubbing the sides you can hear it move when you turn the carb over and over.