Hey guys I don't mean to be an a-hole and make my first post like this but I really need help! Ive lurked on the forum for a while now but never had anything to post and always found the info i was looking for. Heres the deal, Just got done with a total rebuild of the engine trans and did some mods along the way. Got everything back in the truck and she wont start. Ive checked everything i can think of and still nothing. I need to get the truck running like 3 days ago. haha any help is greatly appreciated hopefully some one will be able to help on christmas eve. Heres the break down.

Things that changed/upgraded from when it ran last.
1)Fass system (bought it used didnt come with a harness so I made one. Truck had been converted to an in tank lift pump so the dealer had put a pig tail from the stock block mounted LP location to a relay on the fire wall. I cut the pig tail from the relay and wired it to the coil side of my relay for the fass. It wouldn't click the relay on so i measured voltage and was only getting 8.65V when it was hooked to the dealer installed relay it would click constantly on and off.) Is there something wrong with the LP circuit from the ECM? I wired the relay to a switch in the cab and totally did away with using the pig tail out of the harness for the factory LP on the block. Does the ecm need that to be hooked up for some reason?
2) Pin # 11 on the ECM C2 (G7 18WT/OR) Had to be repaired as the previous owner had a short in the harness and ran a new wire from the ECM into the harness across the firewall.
3) Total motor strip down and rebuild. ECM and harness was completely disconnected. (wondering if I have a bad ground somewhere or something not hooked up properly.) (Saw this thread, guy said he had a ground in the wrong place. https://www.dieselbombers.com/5-9-li...ont-start.html) What gorund could that be?

Things I've done already.
1) checked for fuel at cp3 supply line from fass
2)checked for fuel at the rail (cracked injector lines 1/2-3/4 turn and got fuel seeping out of the lines.) also cracked the banjo on the top of the pressure relief valve didnt get any fuel out of it while cranking but some did bubble out a few seconds after stoping cranking. I loosened the valve itself from the rail and tightened the banjo again, got more fuel volume out of the cracked rail to valve connection than the cracked valve to banjo connection.
3)pulled the valve cover to ensure none of the injector wires were touching the rockers
4)checked tank return (getting a small trickle of fuel with the fass running but not cranking the motor, cant tell if its any more when cranking because I'm working on it alone.
5) checked the FCA harness ( turned ignition on, unplugged the harness from the FCA and put a test light between the two terminals, waited 20 sec and it flashed doing a self check)
6)pluged in the smarty and checked codes got a **** ton the first time, but i think it was just because everything had just been unhooked.
1st time I got 0628,0533,0480,0251,0837,0524(x2),0483,0646,0107,0 073, and a crank position sensor code too but dont remember the #. Cleared the codes and tried cranking again to see what would pop back up all I get now its 0628 (fuel pump relay circuit low/ lift pump control circuit low.) and 0480 (cooling fan 1 control circuit open (low speed fan relay)

Any ideas guys? FCA bad? leaky feed tubes? Im lost at this point.

Merry Christmas, Chris