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I had a similar problem once with a '54 Chevy pickup. The fuel pickup tube in the tank did not have a strainer over the end - just an open tube. When the fuel level got low enough a splinter of wood (!) floating in the tank would enter and clog the pickup tube. It would then fall back out after awhile, then the engine would start and run ok until the next time. I found it because I could not blow back through the fuel line to the tank and hear any bubbles.
A clogging fuel filter usually causes your top speed to gradually decrease until you can't run above 60 - 70 mph, then you notice it.
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