Truck will crank then die. its like something is cutting the fuel off. on 1998 Chevrolet 1500 Pickup

Is there some kind of security code to this problem???

Got the little resistance pellet (chip) in the key?
No. Its been scanned. also if i pour gas in the throttle body it'll crank up & run until gas is all gone then die again
Replace fuel pump module! Without a doubt.
Okay. we've replaced fuel pump.
where is the fuel pump module?