First question is, are you getting fuel flow to the carb..?? If not, check the screen in the sediment bowl, to make sure it is clean. While apart, open the fuel valve, and make sure you have fuel coming out of the tank to begin with. I've seen a buildup of a gray, gummy substance build up in the actual valve assy. You'll need to either remove the tank & drain, or remove the valve, and catch the fuel in a container. Disassemble that valve and give it a good cleaning with some spray carb cleaner, or Acetone.
If you have a good fuel flow to the carb, here's a few things to check.
Did you remove the strainer elbow, where the fuel line attaches to the carb.?? Many don't even know there is one. Remove it, and give it a good cleaning with above mentioned solvents. On the other hand, I have seen these strainers completely deteriorated. If it is in bad shape, it'd be a good idea to get a new one. I think most run like $7-$8.
Did you remove the drain plug from the bottom of the carb., and see if the bowl is filling..?? Could be the float is stuck,and not letting it fill, or needs adjusted, to let more fuel in. Fuel level in the bowl should be approx. 1/4" below the top of the bowl. An easy way to "see" what the fuel level is in the bowl, is to get a 1/8" npt barbed fitting at a hardware, which should be a common item. You'll also need about 1' of clear plastic tubing to fit the barbed end. Shut the fuel off, then remove the drain plug from the bottom of the carb., and insert the barbed fitting. Slip the clear tubing on, then make a 180ｺ in the tubing, up along side the carb.. But not so sharp it crimps it off. The fuel needs to flow through the tube. Now turn your fuel on, and let the bowl fill. The fuel level in the bowl, should be the same, showing in the tubing. If the fuel level is not in the approx. range of 1/4" from the top of the bowl, adjust the float, so that it is.
Is the choke plate completely closing..?? Make sure the choke rod isn't catching, or binding on something, and you're getting full choke. Have you tried placing the flat of the palm of your hand across the intake of the carb., to draw gas up..??
If you're good there, I'll have to ask just how far you tore the carb down. Many split them, and clean the ports as you should, but miss a key item. You'll need to also remove the discharge nozzle. This is the brass tube that comes up out of the center throat of the carb, on about a 45ｺ angle. Just be careful, as there is a small washer/gasket it seats on in the carb. body. It will more than likely take a smaller deep well socket, or hollow nut driver to reach the hex part to remove it. Remove it, and look for two tiny cross drilled holes towards the bottom of the tube. Hold it up to a good light, and see if they are open. If not, a small wire, like a single strand out of a wire brush, or a strand of copper wire out of a piece of automotive type, stranded wire. These holes need to be open, as that's what the gas draws up through, into the throat of the carb. Spray with carb. cleaner, and a shot of low pressure compressed air.
If all of this has been done, and still no gas showing on the spark plugs, then I'd suspect a vacuum leak somewhere. Either the carb., to manifold gasket, or manifold, to head gasket.
I've attached a link to the New Holland online parts store, that shows an exploded view of the N carbs. #16 in the exploded view is the strainer elbow I mentioned,and #9 is the main discharge nozzle, which should be removed, and checked to see if the tiny cross drilled holes are plugged.
Hope this helps..!!
Official New Holland Online Parts Store and Online Parts Catalog for New Holland and Ford Tractors.
