Joe:

It's on the part you unscrew -- at the top of the threads. Fits into a shallow slot against a flange, and goes down into the top of the part you don't remove!

They tend to cut on the egdes, and this is where the fuel leak is coming from.

Peter

__________________
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!