[Gaz64]

Mounting of the fuel pump (pump section) should be near level with bottom of fuel tank.

You still draw from the top, since the fuel will go up then down to the pump. Effectively functions the same as drawing from the bottom of the tank.

Once it has primed, it will stay primed. BUT drawing up then down makes the pump difficult to prime.
Don't let the pump try and prime itself, have a line off after the pump, and pressurise the tank (about 2-5 psi should do it).