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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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