just rolled my 87 f-150 fuel injected 300 swaped cab out with an f-250 two wheel drive onto my frame, replaced new computer using my vin off the f-150 and now the fuel pump won't turn on or run. im using the wiring harness that was in the f-250 so could that be the problem. please help

 

You need to get the wiring skematic on both trucks to insure that the wiring is the same. You may have a wire in the wrong place on your ecmwiring plug. also check your inercia switch.