I confirm this is the swirl flaps actuator, the grease and junk you see around it is probably coming from the swirl flaps seals under the intake manifold. The linkage between my swirl flaps actuator and swirl flaps linkage fell down when installing motor mounts (I'm 100% sure was already brken and got stuck somewhere around motor mount), so I guess my new mod is to do the swirl flaps delete mod, clean intake and delete the EGR. Also bought a catch can so no more dirty intake, hurray.
If you suspect having a fuel leak, the symptoms are hard to start car when cold (after hours of engine off) or visible bubbles on fuel lines. The fuel hose orings rot over time and end up leaking air inside. Also, the GC 2.7CRD which has the OM612 engine doesn't have an electric pump on the fuel tank, it has a low pressure pump and high pressure pump at the front top of the engine (black triangle shapped piece is the high pressure, small rectangle shaped piece that connects with it is the low pressure). The low pressure fuel pump sucks fuel from the fuel tank. Fuel isn't pumped before ignition, so is there's any air leaks in the system the fuel will go back to the fuel tank, when cranking the engine the low pressure pump has to suck all the air between the pumps and fuel tank first before any fuel pressure is reached in the common rail.
Other less common leaks can be the fuel pump gaskets or fuel filter orings.
I would buy the OEM orings from Mercedes and replace all of them (6 if I remember right). I ended up replacing the 3 hoses but was a pain in the arse, although not a complicated job but you need to remove some stuff to do so. New orings should do the trick. It fixed my long cranks in the morning, it now takes like 2 seconds to fire.
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