Well - you seem to have done all the right things. I would agree if the choke gets you to the barn it is likely to be a fuel problem. Before giving up I would suggest the following:
1) Add a fuel pressure gauge just before the inlet to the carb. This would rule out any restrictions in the fuel line, tank venting issues etc. I have found fuel filters do not run full - so that is not a worry item for me.
2) You have mentioned several times of cleaning the fuel inlet valve needle and seat. This valve typically fails by trapping dirt between the needle and seat preventing it from closing. This results in flooding rather than a restriction of fuel flow. If there is a restriction caused by a particle of dirt it would most likely be inside one of the carb passages. This particle floats around until it gets sucked up against an orifice (metering jet) causing a restriction of metered fuel. Stopping the engine can allow it to fall away from the jet - allowing normal operation - until it gets in the way again. I did the new fuel filter, added an electric pump etc. to no avail when I had a similar problem on my Kohler. The problem went away when I blew out the carb passages. To blow out the passages the metering jets need to be removed and use high pressure air, blow in both the forward and reverse directions.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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