Sounds like all the possibilities have been covered, but I will share my experience on a 68 4000 diesel. Similar problems developed, engine shutting down after 10 minutes or so at or above third throttle. I would shut it down and remove fuel lines and get steady drip of fuel. Bleed everything and go again for a while, same problem. I noticed when I purchased the tractor it had numerous nicks around the fuel shut off where previous owner had apparently been tapping. I drained the tank, removed the valve and screen. It was partially plugged. Made a mop out of dowel rod, attached a piece of sponge and rag with wire ties, and with a pen light cleaned the sludge from the tank depression. New valve and screen, no problem since.
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Today's Featured Article - Fire in the Field A hay fire is no laughing matter-well, maybe one was! And a good life-lesson, too. Following World War II many farm boys returned home both older and wiser. One such man was my employer the summer I was sixteen. He was a farmer by birth and a farmer by choice, and like many returning soldiers, he was our silent hero: without medals or decorations, but with a certain ability to survive. It was on his farm that I learned to use the combination hand clutch and brake on a John D
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