Thanks, Linda.
About the fuel pump picking up gunk... I found this:
About 2/3 of the way thru that video it shows pulling the fuel pump assembly out of the gas tank.? The fuel pickoff point is at the bottom and looks like a foot.? So it seems that fuel is always drawn from the bottom of the tank, and not some kind of floating pickoff that takes the fuel from near the top of the level.? So how does running the tank dry contribute to picking up gunk if the fuel pickoff point is near the bottom?
Hopefully I can insert a photo here, taken from that video...