Another thing to check is the vacuum shut off on the back side of the injection pump. Remove the vacuum line and make sure there is no oil. When the shut off fails it will allow oil into the vacuum lines. A BIG MESS. Always remove your fuse to check them. Old fuses corrode at the ends and look good.

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2009 CLS550 55,000
2004 ML350 144,000
2004 X5 95,000
2002 X5 165,000
1996 320S 155,000 (sold)
1991 190E 192,000 (sold)
1989 300SE 160,00 (sold)
1984 300D 210,000 owned since 85, (sold)
1984 300SD 160,000 (sold)