If so, disconnect the output to the carb, direct the flow to a container. Crank or start the engine, see what kind of flow you get. Should give a full stream, pulsing flow. If slow flow, dribble, air in the stream, likely the pump is bad
If the pump checks good, or there is no pump, remove the drain plug in the bottom of the carb. It should give a full stream and continue to flow (continuous flow when cranking if fuel pump equipped). If no flow or flow slows to a drip, there is not enough fuel in the carb bowl to run. Some carbs have a screen in the fuel inlet fitting, be sure it is clean.
If there is fuel in the bowl, and it still requires full choke to run, check for vacuum leaks. Not sure how the intake is configured, if it is siamesed to the exhaust it could be burned through internally. A vacuum gauge will be helpful diagnosing vacuum and valve problems. Another test, remove and ground the coil wire, opemn the throttle, hold your hand tightly over the air in of the carb, have an assistant crank the engine through. You should get a steady, firm vacuum against your hand, and be wet with gas. If little or pulsing vacuum, there is a vacuum leak or valve problem. If vacuum and no gas, there is a carb or fuel delivery problem.
You may want to revisit the internals of the carb. All fuel must pass through the main jet. Be sure the jet is clean and the adjustment needle is backed out about 2 turns. carb sitting with old gas can clog to the point of needing the passages scraped out with a wire to remove dried deposits. Get this right, fuel in the bowl, the emulsion tube in place in the venturi, and the carb will at least work well enough to run.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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