Weird sound from Rail Return Line and rough idle on cold start

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sejaspalma

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May 29, 2021
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Your Mercedes
W204
Car: S204 220cdi om646 2008.

So there is coming a weird sound from fuel pressure regulator area (rail return line). I have already changed whole fuel rail with pressure sensor and regulator, but nothing changed.
Having a rough cold start. Rpm needle jumping up and down for a few seconds and then stabilizing. Smokes a bit more and mpg is also bad.

I'm having exactly the same problem like in these videos:


 
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