OK, first you have not warm up regulator. That's on plain K-Jet -- warmup fuel mixture is controlled by the computer.

Here's what I would do: Find the diagnostic socket (usually a round fitting with a screw cover). Open it up, and connect the positive lead of a VOM set for duty cycle to the #3 position, ground the black lead. This should read 20% or 50% with the key on, engine off (may be 80% on some California models). Should read a fixed duty cycle when you start the engine cold, then start to swing up and down and steady around 50% with continuous variation as the engine warms up.

And replace the OVP -- resoldering will not necessarily fix it.

Check the fuel pressure, and I would replace the fuel pump relay. You should get the current draw on the pumps checked, too.

Replace the fuel filter is not done recently.

Check for a bad tank screen (you are starving for fuel if it has no top end).

A proper diagnosis will require checking main fuel pressure, differential pressure between the upper and lower chambers on the fuel distributor, and the main pressure regulator.

You should also check the electro-hydraulic regulator on the side of the fuel distribultor -- if it's leaking, replace it ($$$) as you have no mixture control.

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!