'07 ML 320 CDI. Experienced a failure in the fuel injection system at 40,000 miles. Repaired by local Mercedes dealer but I am not sure exactly what repair work was done. Now 2,000 miles later just experienced the same problem. Does anyone have suggestions on what I should ask or request of the service department? Something is wrong beyond the original repair to have failed again in only 2,000 miles. Thanks.

Ask for a copy of the prior work order so you know what work was done....

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Have you been running any biodiesel, if so what blends? I believe the newer common rail diesels are much more tempremental about the fuel viscosity.

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Mo money, mo tech, mo mpg, mo problems.

My understanding is that the Common Rail System has much finer filtration than the older models. This could also mean that the Filters plug up easier.

I would try changing the filter/s first.

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84 300D, 82 Volvo 244Gl Diesel

and a vague "failure in the injection system" I won't hold out for a detailed story...BUT DDBISHO if you are still following this thread,

Please be more specific about what failed the first time and what failed now. I was surprised to learn there are fewer parts in the CDIs than in the indirect or direct/element systems. I did the classroom course on them but very little beyond that.

Also, did you EVER put in any vegetable oil/SVO/WVO or biodiesel?

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!