Check for fuel leakage at the pressure valve holders, under the retaining rings on the top of the IP. If the o-rings have gone bad, fuel will run down the side of the pump onto the gasket, causing it to leak.

Cheap fix, new 0-rings and seals cost me a huge $7.81, fixed the rough running on my 87 300D.

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!