Mercedes-Benz W212 fuel filter housing and leaks
W212 V6 CDI: how do I get the fuel filter out from under the turbo pressure pipe?
The pressure pipe does not have to be removed completely. Loosen the three screws of the mounting frame and the pipe connections and tilt the filter towards the cabin. Also remove the clamp at the lower end of the filter, because the filter will not come out without doing so.
The W212 is losing coolant and it runs down under the fuel filter, what is leaking?
The leak may come from the water circuit of the filter housing. Replacing it fixes the fault. On the OM651 it is enough to detach the exhaust gas cooler from its mounts and lower it. Drain the coolant from the radiator drain tap and use longer screws for the new housing. The plastic of the housing is thin, so do not force it.
W212 350 CDI leaks fuel from the fuel filter hose connections, what fixes it?
Crimp-type clips do not always hold. Clean and dry the connections and replace the clips with ordinary hose clamps. If the end of the hose is deformed or cracked, shorten the hose and remake the connection.