I'm experiencing the same thing and I'm not sure it's vapor lock. The galvanized material inside of my jubilee's tank is flaking off, so I installed a 1/4 in line fuel filter just before the carb. Thought I was experiencing vapor lock, so I installed a heat sheild and no luck. Next, I installed a plastic lawn mower filter that I could see the fuel going through it. After a short time of running, the filter filled with air. Removed the filter from the gas line and fuel came out the gas line. Decided to get a foot of rubber gas line and install the filter vertically, thinking the air would go up to the tank and the filter would fill up with gas. NO LUCK. The air inside the fuel filter would not go up the 1/4 inch steel gas line. It was like it was vapor locked without a source of heat. The only way I could bleed the air from the filter was to remove the hose on the top side of the filter and let the air out and gas in. I'm thinking the problem may be solved by installing a larger diameter fuel line that will allow air to go up the tank. It's like taking a drinking straw and filling it with a liquid and placing you finger over the top of the straw. Air doesn't go up the straw and the liquid won't come out the straw. Try doing that with a larger straw or pipe and air will go up and drain the straw.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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