Please help fast Dead ECM?

I am thinking the computer maybe junked out. Ok I bought a van around six months ago. It is a 1997 coversion van with the 5.7 tbi in it. When I bought it the fuel pump was bad so I temp. fixed it by hammering on the tank and it unstuck. It had been fine ever since. Last week I pull it in the garage to pull the junk 4l60e to have the clutches replaced, reinstall the trans and nothing, the van would crank over but the pump was not turning on, I try a new relay and nothing. I assume its a bad pump, I then install the new pump and the same thing just crank and no start. I also couldnt get the thing to really hit on ether either which is odd. I then check the old pump and it comes right on. So I keep trying to check grounds and make sure I didnt unhook anything on the trans job that would keep the pump from turning on and I cant find anything. Then today the battery was dead from all the cranking so I try to jump start it and cranked it over a few times and nothing then on the fourth try it started cranking a everything quit. NO more cranking, no interior lights, no dash lights, radio or anything. Keep in mind this was with jumper cables hooked up so there was plenty of power. I checked all of the relays I could think of and they are all great. Is there a main relay somewhere or what? Im thinking maybe the computer went out and maybe thats why it wouldnt turn the pump on then it crapped completely out when jumping it. Please help me.

When engine cranking does it have spark to all good plugs?
If so check fuel pump relay and power to relay and out of relay to fuel pump.
Can you jumper gray wire to fuel pump and get pump to run with proper fuel pressure?