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BLACK SMOKE IS A RICH FUEL MIXTURE.MERCEDES HAS THE CIS FUEL INJECTION SYSTEM.YOUR PROBLEM COULD BE IN THE DIFFERENTIAL PRESSURE REGULATOR.THE MERCEDES DEALERSHIP WII HAVE TO FIX THEY HAVE TO USE SPECIAL EQUIPMENT TO WORK ON THE FUEL INJECTION SYSTEM.
Check if you have sparks.
1- If there is no spark, check the coil for replacement.
2- If there is spark then there is a problem with the cold start valve.
It is a normal close valve and only open during the cranking. When it is bad, it normal open the too much fuel coming in wetting all spark plugs before a combustion taking place. Good Luck.
Check Injectors spraying Fuel when you start.
Fuel pump prime because you hear the pump. IF pump is weak, then your Fuel distributor doesn't have correct pressure to spray fuel when injectors open. Do your sparks plug wet after trying several times.
If they are dry then you don't have fuel. Replace injectors
If they are wet then you don't have correct air:gas ratio of 14.6:1. Replace Fuel distributors
change the fuel filter it maybe clogged, check for any vacuum leaks even at the intake manifolds
I would recommend trying STP fuel injector cleaner in the gas tank and make sure you have at least a half a tank of gas when adding and then finish filling it up and take the car out on the highway and drive it to run it through the fuel system and see if this helps and if it does then change the fuel filter
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