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 - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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