HELP motor swap will not start code p1094

just replaced the motor in 03 5500 with a motor with 50000 miles. truck will not start. seems to be no air from priming at fuel housing done that many times. truck will start and run with starting fluid and idle normal. also replaced with new glow plugs. have code p1094. I have snap on solus edge scanner. any help would be great.

p1094 fuel rail low wheel idle or fuel cut.also have code p0380 glow plug/ heater circuit