This promaster is my 9th diesel van, the others have had either electric or mechanical fuel pump that were not in the tank. Im not sure but this one probably is in the tank. I have always run the fuel tanks down to nearly nothing, mostly to get any contamination be it dirt or water sucked up into the fuel filter. Maybe im right or maybe im wrong but i have not had any issues from it. i have always been of the mindset to run a full tank of fuel, i guess a holdover from the days of lawnmower gas; adding new gas to a partial can of old gas does not make the old gas better it makes the new gas worse.