Most common shutoff problem is actually a bad bit of rubber hose between the main vac line and the plastic tubing -- they get old and hard and leak or break.

You have to push down pretty hard on the shutoff lever on that engine, not like some of the others.

Check the condition of the rubber seal in the filler cap -- if it is bad (if you can see a distinct dent where the lip goes it's bad) and fits loosely, you will splash fuel out on bumps and turns. I have this problem on the 280 SE, and have an aftermarket cap on there at the moment. Quite a bit of fuel will spill out, then drip for a while. Diesel won't evaporate at ambient temps very fast, so it stays around.

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!