A good way to prime your engine is to pinch the pressure line (the line going to the pipe) and then snap the lid on the gas tank. Once you get good at it, it should only take 1 snap of the lid to prime your engine good.

Another way to do it is to plug the stinger on your pipe and turn over the engine. This way is better for non-pullstart engines because the starter box turns the engine over fast. I don't really recommend this way for pullstart engines because its akward trying to pull the rope and plug the stinger at the same time and also you wouldn't be able to turn the engine over fast enough to prime it fast.

I perfer the first method with a pullstart engine but for non-pullstart engines, I find the second way easier because you can have the glow initer on the engine and everything ready and then start turning over the engine and plug the stinger and let go after the fuel gets in the carb and then it fires right up.