Had a similar problem on a new-to-me engine recently. Engine would run good for a while then die. No fuel pump involved--just gravity flow. Replaced line, shut-off valve and filter with no improvement. Upon further troubleshooting noticed that I got very low flow even when I ran fuel straight out of the tank into a bowl held beneath the outlet with the tank cover off. Turned out the tank had an internal filter at the outlet and it was plugged nearly solid. With no way to eliminate it short of replacing the tank, another filter already inline downstream, and nothing to lose, I ran a small drill bit by hand up into the outlet and drilled through the filter. Reinstalled line and got full flow, and it's had 100+ hours of run time since with no further problems. Just something you might want to investigate before replacing more parts.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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