There is a copper seal sitting on top of the pressure valve body, they are cheap and once you are in there that far, it's kinda silly not to replace them.

However, this is usually a problem on a car where the o-rings on the pressure valve holders have been replaced to fix the fuel leak when they go bad. If you have fuel residue on top of the IP, chances are you need to replace them since the old ones didn't seal.

I'd replace the rubber o-rings too -- total cost when I did this three years ago was less than $9.00. Cured mine.

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!