Read the instructions completely. My pump is "self priming". But not all are made that way. And be sure to have a solid ground. Realize we all have gone through this "head scratching" situation with the electric pumps. Good luck.
That's a great point, which reinforces to mount one well below the tank so it is basically gravity fed. Even the pumps that are self priming may prime them selves, but even they are not made to pull fuel all of the time.