I take a new (clean) piece of hose over fuel inlet. Blow through it...should of course be no resistance. As you're blowing rotate carb upside down (do this over a box if it's apart to catch parts that may fall out). As floats drop you'll feel it shut off airflow.
I have done it with air compressor set at 4-5 psi using rubber tip blow gun.
If it's flooded pull a spark plug. Wet, it's flooded.
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Ok I’ve had that ole 3414 for a while! I’ve worked on just about every issue you can think of with this thing!
First off let me tell you that a Jeep carb can be bought new for around $80 to replace that zenith. There’s not any replacements to be had really. There was a guy selling his own modeled carb and is on mine. Turned out the quality is crap! You can rebuild them but again it’s about the same as a new Jeep carb.
Do yourself a favor and bypass that mechanical pump and just install an electric pump. 3-4 lb universal. Saves future headaches.
If yours is converted to 12 volt. Check your resistor to the coil. If good check you’ve got fire going to the plugs. It could be a condenser or the points need filed. If there is good fire to the plugs. No need to look further right there. Whoever said replace plugs just cost you $. Hell this thing will chug over and run on one good plug. Ask me how I know🤣.
Now if were are back to the carb issue. Take the fuel line off where it feeds the bowl. Hang it over the side or stick it in a clean glass bottle. Crank the tractor over. See if it’s pumping. If so then it’s the carb.
Now take the top of the carb off. Connect the fuel line. Have someone crank the tractor o we while you press down on the U Spring that holds down the float. See how far the bowl fills up before the needle shuts off the fuel flow. This is time to set the fuel float and fuel level in the carb by bending the tang on the float. This is a repetitive process of removing fuel, cranking the tractor over and checking fuel level.
Make sure before you do any of this that the brass fittings that screw in behind the needle are tight and seated.
Now with the fuel level set there should be no overflow and flooding issues. It’s time to set the carb. Truly I forget the exact process but it’s on the web.
There is a fuel air mixture on the bottom. Likely won’t need to adjust this right away. There’s also a T handle adjuster. Yours might not be a t but it’s facing the tanks and on top. Screw in then back out 2 1/4 turns. It should fire right up. From there this screw can be adjusted to meter the fuel.
This is brief and a quick, crude and poor attempt to help you get her going again. I know how it feels to be at a loss. Good luck buddy I hope Ive helped a little!