Fuel pump pressure question

Had a little problem with my '05 Tacoma V6. Someone put some sugar and water in my gas tank.
I have removed the tank and flushed it. Although a number of myth buster type sites on the internet say that sugar does not dissolve in gasoline, it sure makes it sticky. A light solution of Simple Green and then water seems to dissolve the sugar and remove the stickiness.
I disassembled the fuel pump and flushed everything first with water and then gasoline. The motor itself, I flushed with water, air dried it and then pumped gas through it with a hand pump.
The motor ran fine on 12 V for 10 second periods as I read you are not to run it longer than that out of the tank and truck.
I reassembled the pump and immersed it in a few inches of gasoline. The pump is pumping when connected to 12 V for short periods.

Finally a question. How much pressure and volume should I expect to get when testing it in this fashion? The gas only rises about a half inch above the outlet on the top of the pump. I expected much more even though I only run it for ten seconds at a time.

Thanks Andy