Please verify that the car was running fine, then the next day it wouldn't start...and absolutely nothing was done to it in between? What I'm getting at is it could be as simple as the fuel prefilter being changed and no O-ring installed on the new filter...or the car security system lost power and therefore does not recognize the key, and will let it crank but not fire. I've experienced both of those.

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Mark in MA
05 MB E320CDI 402k Granite Grey Metallic
05 MB E320CDI 267k Black
05 MB E320CDI 232k White
05 MB E320CDI 209k Tectite Grey
99 Dodge 2500 Cummins 5sp 148k
62 Jeep CJ-6 120k