1989 Nissan Truck fuel line/throttle body

Is the injector/s pulsing? Also check the fuel pressure if its within specs.

there is no fuel inside the tbi, is there anything like a switch that will prevent fuel from flowing if it is turned upside down? i took the intake off as one piece when i rebuilt the motor. it got moved around.

When you turn key to run do you hear the fuel pump come On if so check the fuel pressure there should be fuel on the line

there is fuel up to the inlet of the throttle body the pump is working. it is something with the throttle body itself. do you know anything about this tbi?

Open it up and investigate-also check the fuel pressure regulator

how do i test the fuel pressure regulator