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Sounds like vapor lock from heat in line from throttle body to flow divider & maybe in line to fuel pump. Engine would rev on primer fuel and stall when pump pushed vapor to nozzles.
One technique: full throttle, idle/cutoff mixture and run aux pump for about 20-30 seconds to push cooler fuel thru lines to pump. With pump on, Hit starter and crack mixture 1 inch open or so until she lights off. Then quickly turn pump off, and open mixture full rich while pulling throttle to idle. Takes three hands or practice to time it all correctly.
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