Can also be a bad accumulator letting the pressure drop in the fuel distributor, so that the fuel boils and you have vapor lock after a few minutes.

Get the fuel pressure checked and have the fuel distributor checked for leakage -- nozzles alsol.

You don't have a problem with a fuel leak when the engine is cold because it needs extra rich conditions to fire anyway -- the fuel doesn't burn very well in a cold combustion chamber, so most of it goes out with the exhaust. In a hot chamber, all the fuel burns and you run out of air before the car starts up properly, the plugs get wet with fuel and carbon up and short out.

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!