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

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Is there some kind of security code to this problem???
(1) Answer
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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?