Evaporation is normal with any carburetor and this new fuel for sure doesn't stick around very long.
However it should re-fill very quickly and you should never have to prime it with fuel. I'd be wondering why all the fuel in the lines are draining back to the tank and even if they did why the fuel pump isn't picking up the fuel and filling the carburetor with a reasonable amount of cranking time.......Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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