Weak spark can mimic fuel problems. Check the spark quality at the plug end of each wire when it acts up. Should have at least 1/4 inch spark to ground. It's probably electronic ignition, but if points, check the condition and gap.
Does the carb have the small screw in fuel filter at the carb?
Those are known to easily clog. If it's there, take it out, try to blow through it. It should blow through easily if it's good. There may be other filters, inline or incorporated in the pump.
Does it have a mechanical fuel pump? If so with the line disconnected from the carb, and directed into a container, crank the engine. It should give strong pulses of fuel, not a dribble. If an electric pump it should give a steady, strong stream, no dribble, drip, or air bubbles.
Could be a bad pump, bad suction hose, look for dry rot, cracked, collapsed. Fuel line exposed long term to ethanol gas can swell and flake from the inside and still look good on the outside.
Weak spark can mimic fuel problems. Check the spark quality at the plug end of each wire when it acts up
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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