A 4BD1 just needs fuel, air and a good battery to start. Glow plugs are not needed. As Brian says, it could be your EDIC motor or it could be the fuel lift pump (or air in the fuel).
The EDIC motor is the thing that makes a noise when you turn the ignition on, and again when you turn it off. A blown fuse or loose connection may mean it locks in the off position.
So first - check for the noise when you cycle the ignition.
The EDIC motor is on top of the drivers footwell. There is an electrical connector near the clutch reservoir - the fuse unfortunately is behind the dash.
For a quick bylass you can unbolt the 2 small (10mm) bolts on the inlet manifold which hold the edic cable. It will then revert to the on position, and you will need to stall it in gear or open the bonnet and pull the cable to stop the engine.

