How does that happen when the entire port is held closed with piston in place?

I am talking about rotating the crankshaft so that the piston sits mid stroke, TDC is no good due to it being very difficult to hold there and sub piston induction could cause lower crankcse flooding and BDC is obviously the worst place as the exhaust port is entirely open.

So with the exhaust port closed and sealed off, squirt some raw fuel against the closed off port, immediately the excess will drain off leaving a very thin wash only on part of the piston wall but fumes galore hanging around. Then flip the engine, the thin wash on the piston wall plus the fumes will be more than enough to support ignition causing a quick burst of life, this in turn will be enough to start the draw from the spraybar - assuming of course that you have finger choked the fuel to be drawn up the tubing to the spraybar in the first place.

I have found that putting drops of fuel down the throat of the venturi to result in flooding every time. You really need fumes to fire off a model diesel not drops of anything.

Talk soon, Chris.