Replacing the engine fuel filter on a 2005 E320 CDI is one of the easiest things you might consider doing yourself. It's located near the front of the engine right on top. You have to remove the plastic covers over the engine manifolds, (also easily done but don't lose the bolts that hold it on). Once you do that you'll see it right in front of you. The replacement part from MB comes with everything you'll need - O-rings, gasket, etc. Once you have the filter installed you have to "bleed" the air out of the system. The filter unit has a bleed screw on top. Just loosen it and crank the engine until all the air is out of the system, then tighten again.
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Has the fuel filter been changed? It sounds like a fuel starvation problem. Not familiar with the Mercedes diesel I had a Dodge Cummins 24 valve diesel and had the same trouble when the fuel filter had gotten to dirty. Another issue could be the fuel pump itself is starting to go, not a usual problem but would cause the engine to cutout if it is not providing enough fuel. Which in turn would make it hard to to start after since there is not enough fuel in the system. Also check if there is a filter in the fuel tank could be plugged. Check the fuel also, see if it has started growing algae in the tank if this happens it will plug filters quickly. Good luck
First thing i would do is change the fuel filter. diesels need them changed more often then a gas engine. if that doesnt help it could be the injector pump\ fuel pump. pull a fuel line off somewhere at the engine ( at an injector ) have someone turn it over and make sure its getting fuel
diesel fuel run in the winter is a lighter grade fuel to help is from freezing, and hard starting in the winter. You mnay have to replace the aircleaner. And may have to replace the fuel filter located on to of the engine, just under the air cleaner housing. The diesel fuel now sold in the summer is a little thicker and having a hard time getting thru the old fuel filter.
Make sure all lines are light when turning engine over.While turning engine over loosen the a line closes to pump or the fuel filter.You should get some fuel.Then continue on all lines working farther away.
diesel engines do run dirty if this was my car i would change the oil and oil filter as a mater of corse, at lest you will know its been done then, also change the fule filter and have a look at the air filter as well
diesels dont like dirty fule or partly blocked filters, for what they cost its well worth the effort if you have only ever run a petrol engine you will find that the diesel need more servicing more often if you leave it unserviced the engine wont last as long as it could so dont skimp on the servicing or you wont be saving pennies you will be spending pounds
Sounds like a compression leak from one or more injectors into the fuel system. I am guessing that you already changed both the frame and under hood fuel filters in the last 15,000 miles? Be sure the cap on the frame fuel filter is tight, any gap between the cap and housing can cause fuel to return to the tank instead of going filtered o the engine.
yes there is a low pressure pump and a high pressure(incjector pump) if your no getting fuel to engine check for low pressure pump to be working may also have air in system which is very hard to get out and a diesel wont run untill most or all air is gone