97 E320 Still Wont Start!!!

[Timlewak]

My 1997 Mercedes E320 has been down and out for the past couple weeks. I have had it to a garage that keeps telling me its a relay fuse which they can't find. Someone else on here told me it was a crank sensor... Which I drive an hour to the dealership today and picked up only to get home and that still hasn't worked. I have spent well over a thousand dollars on this car trying to get it started. It has 190k miles on it now... The fuel filters are new, the pressure is good in the lines and the fuel pump is new... but still the car wont start... It cranks and cranks and still no start. Please help me!