N47 diesel quality control valve

 I know this picture sucks but down there is the High pressure pump for the N47 Diesel engine ,,,,,the pump is located under the intake manifold and at the rear of the engine,,,,the car came in with check engine light on injector cut off cylinder 1,,,,so we have to submit a Puma case to release fuel injectors. So Puma wanted me to remove the quality control valve on the high pressure fuel pump,,,,the valve is bolted on the side of the pump with 2 bolts nothing fancy just difficult to get to. What they wanted to see if the screen was clean of any metal pieces,,,,as you can see it was clean,,,Puma wanted to make sure the high pressure pump was not coming apart,,,,so since everything was clean they had me replace the injector.

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6 Responses to N47 diesel quality control valve

  1. Hi Andreas, say, what was the fault code, 24xx00 or something? How much fuel comes out of the hole when you pull the valve? From your post, it sounds like a damaged pump chews itself up pretty fast (rather than slowly filling up the injectors with fine particles before completely shredding). Thanks!


  2. Does Puma not advise you to drain/inspect the fuel… In the case that’s what might be causing all these problems?


  3. Maxx says:

    Hello Sir,

    Question for you, how reliable are the 2011+ 535d are ?
    I’m thinking about replacing the N20 with diesel … are they any better ?

    Thank you !


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