Here's a picture to help everyone realize why we need a gas tank skid plate (if only my wife had let me buy one already)

As an update, I've ordered a new one off rockauto. Denso. Hope it's a good one, I need it asap.
Upon a lot of thinking, I can't see what I did wrong that caused it to fall. It fell when I wasn't around so I didn't see it. It appears that the cinder blocks cracked and broke somehow and the jeep shifted forward enough to make the jack stands unstable, and it fell. When it did that, somehow the scissor jack ended up being under the gas tank, right in the middle, where the fuel pump is.
The bottom float portion of the fuel pump is destroyed and the actual plastic that holds the pump itself is totaled.