If the injectors click while cranking, the computer is fine. If you have an ocsilloscope, you should be getting about 7 ms injection pulses. If the injetors are dead and the fuel pump cuts out when in the run position, the ignition wiring or the ignition switch is shot -- this may be related to a butcher job on the transisitor box for the ignition.

You must also verify that you actually have the fuel pump running and producing pressure. When these sit for any length of time, they get stuck. Can be freed up, but if fuel delivery is poor, it won't start.

The cold start valve usually will only operate below freezing. It's operated via a thermo time switch in the manifold (or somewhere) that senses engine temp, and a relay that is switched by the computer.

Replace the ignition with a Crane or Pertronix unit, they work better. Verify that the ignition wiring is correct around the resistors and that you actually have juice to the points, else it won't go due to lack of spark!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!