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C220 cdi not firing after high pressure fuel pump swap

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Jaz1991, Oct 29, 2012.

  1. Jaz1991

    Jaz1991 New Member

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    Your Mercedes:
    Mercedes c220 cdi avantgarde
    Hi there, just swapper over the high pressure fuel pump on my c220 cdi, with a genuine replacement Bosch spare. The part that came out was a cn2 and its replacement a cn3 . The car is refusing to start, I can see air bubbles rising Ito the small pump and air in the lines back to the filter. I did not fill the pump as there was no obvious filling point, only by submersing the whole pump can it be filled I guess and I haven't done that. Any advice would be greatly appreciated as I have been told its self bleeding but haven't had any joy
     
  2. Cole@MBS

    Cole@MBS Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    124 300 CE 24 Coupe, 209 240 CLK
    They are self bleed but take a lot of cranking, sometimes to the point of flatting the battery, I mean cranking without stopping!!!!!

    Welcome to the forums.
     
  3. OP
    Jaz1991

    Jaz1991 New Member

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    Mercedes c220 cdi avantgarde
    Hi mate we have already cranked it until the battery flattened and have since recharged it to start another round of cranking. It's still not firing
     
  4. jj1975

    jj1975 Senior Member

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    essex
    Your Mercedes:
    w203 c220cdi 2002
    Hi
    If you see air inside of fuel lines it means fuel dont reach the pump , the fuel tank should be full will be easy for the fuel to come up maybe this can help
     
  5. Cole@MBS

    Cole@MBS Forum Supporter Authorised Forum Supporter

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    Have you got the pipes the right way round into the high pressure pump???
     
    Jonathan Lingham likes this.
  6. OP
    Jaz1991

    Jaz1991 New Member

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    Mercedes c220 cdi avantgarde
    Hi mate, is there a diagram? I put it back the same way it came off. But a diagram would be helpful
     
  7. Cole@MBS

    Cole@MBS Forum Supporter Authorised Forum Supporter

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    The one line with the black plastic outer goes to the engine side of the pump, the plain clear pipe to the front........
     
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  8. OP
    Jaz1991

    Jaz1991 New Member

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    Mercedes c220 cdi avantgarde
    Hi there , the car fired up yesterday, but there's still an issue with the fuel lines , there is air passing through from as early on as the filter outlet causing poor starts and sometimes no starts. There is also a slight hissing noise coming from the device behind the fuel filter, that supply's diesel into the filter . Thanks for all of the guidance so far
     
  9. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    C220CDI AMG Line Premium, SLR McLaren Roadster, SL55 & C32AMG
    How much fuel is in the tank? Anything less than 1/4 then go and add 20 litres of diesel and see if it goes. Sometimes if you have less than a 1/4 and you open the system, because its a saddle tank using a venturi effect, air is difficult to disperse. The more fuel in the tank especially if the right side of the tank is full which is the supply side to the engine the easier it is to bleed.

    I have had this issue myself.
     
    Last edited: Nov 1, 2012
  10. Camel

    Camel Senior Member

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    Your Mercedes:
    C270 CDI Elegance Nov 2001
    Sorry for the thread hi-jack, but I have had my high pressure fuel pump replaced recently. The car is running great, but my local garage think my fuel gauge is now faulty. The history is:

    1) Car broke down - high pressure pump replaced
    2) Garage test drive car, and it runs out of fuel with 1/8 showing on fuel gauge (or it breaks down with the symptoms of no fuel)
    3) Garage put £20 of fuel in tank, it works ok. They say my gauge could be faulty
    4) I fill car up, runs sweet. At approx 1/8 of tank, car won't start.
    5) Fill the car up, it is running sweet again.

    I don't think the fuel gauge is faulty as when I filled it, it took the right amount.

    What is the venturi effect? (I did google it, but it looks soooooo interesting.)

    Is there something else that could be wrong with my car? I don;t mind filling up when I get to 1/4 full....but I'd rather not have to I guess.
     
  11. Jonathan Lingham

    Jonathan Lingham Member

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    Your Mercedes:
    W203 CDI auto Estate, 2002, 2148cc
    image.jpeg
    I wonder if I have the same problem? Is there a diagram? I found this on the site, but it isn't quite the same as my W203 220CDI...as you say, two pipes go into that side of the pump. It's possible I've got them the wrong way round. Does the return pipe from the rail go to the engine side or the front?
     
  12. mersum1es

    mersum1es Senior Member

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    Your Mercedes:
    W219/-07/320CDI, W220/-01/320CDI, EX:W211/-04/320CDI, EX:W210/-01/270CDI
    front connector goes to rail, near to engine goes to aux pump
     
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