Well, if you're not sure your ignition switch position corresponds to the on/off markings on the switch, unplug the ignition from the switch and plug in your volt meter, then you should know at which position the ignition is on.

Often the pump diaphragm on a new engine, or on an engine that hasn't been run for a while, will be a little dry and stiff, and it will take a little extra to draw fuel for choking. Also keep in mind, that most of these carburetors are really made for engines with some kind of pull start, which spins the engine much more than just the flipping of the prop we do, and thereby suck gas much better.

DKjens