Well I have already run 3 8 oz tanks through it. The first was super rich at WOT like the manual says, the second was up and down on the throttle, and the third was to get the high speed needle set to slightly lean. I didn't build a test stand, so I've been running it on the plane (SPAD Debonair).
I think the cause of my starting troubles has been that the engine was mounted too high. The carb fuel fitting was about 3/4 inch higher than the output from the tank, so after I primed the fuel was falling back into the tank. I lowered it yesterday to only about 1/4 inch higher (the best I could do) so when I get the time I'll see if it's any better.
Speedster- I don't have a cowl, so I will try pouring some fuel into the carb to prime. How much should I put?