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  1. #1
    Join Date
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    Default CDI fuel problem

    Are there any documented cases of the high pressure pump seal leaking diesel into the oil.

    Since I got the car I have had increasing oil levels, this doesn't really bother me as I just change the oil regularly. I put it down to me doing pitifully low mileage.

    A few months ago on an airport run it felt a bit strange. I could not put my finger on it at the time. It did this again last week, this time it was obviously lacking turbo power after a 50 miles run. A 5 minute stop got it going normally again. This weekend, the next stage, safe mode (3k limit) and low fuel rail pressure.

    Obviously first thing is fuel filter though that is not so old and I doubt it is the problem.

    I do have a spare high pressure pump and am undecided if I should fit it as is, leave the old one alone or fit a new seal kit in it. I don't think I have seen anything on the net about problems with these pumps.

  2. #2
    Join Date
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    Default Re: CDI fuel problem

    Fit the pump (or overhaul and fit the kit) - to eliminate at least given your error codes

    http://www.smartz.co.uk/showthread.p...abrio-Cdi-2002
    fq101.co.uk

  3. #3
    Join Date
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    Default Re: CDI fuel problem

    CP3 pump low pressure leak in way of shaft seal or perhaps a cracked injector but the latter I assume should trigger a fault code as that cylinder would contribute much less to spinning engine around.

    Perhaps there is a way to pressure test low pressure side with pump in situ?

  4. #4
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    Default Re: CDI fuel problem

    I have the equipment to pressure test the high pressure side but it's a real ball ache doing it.

    I suspect the shaft seal because of the rising oil level but I have seen no reports of it actually happening on a 451.

    New filter should be here tomorrow so that first then pump replace.

    I think I will just put my spare on and put a seal kit in the one I take off.

    The pressures report OK through OBD.

  5. #5
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    Default Re: CDI fuel problem

    Take a sample of oil out and set it aside in a jar



    It should settle out I guess if it is mixing
    fq101.co.uk

  6. #6
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    Default Re: CDI fuel problem

    I know it's mixing, there is no mistaking that smell.

  7. #7
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    Default Re: CDI fuel problem

    It should be relatively easy to pressure test low pressure side of pump. Plug return line and fit pressure gauge and test pump to supply line.

    Google Bosch CP3 shaft seal leak is fairly common judging by the vast amount of shaft seals on offer.

    https://www.youtube.com/watch?v=DVRkfvAF-E8

    Of course the OM660 engine has no gear wheel like pump in above video as connected directly to end of cam shaft.

  8. #8
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    Default Re: CDI fuel problem

    Well, fuel filter changed. I knew that wasn't going to help really as it was not that old.

    I do think a warning message along the lines of:

    "DO NOT TURN THE IGNITION ON WITH THE FUEL PIPE DISCONNECTED"

    May have helped me to not paint the inside of the car with diesel. Anyhow. High pressure pump changed, fairly easy job really.

  9. #9
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    Default Re: CDI fuel problem

    Quote Originally Posted by Mjolinor View Post
    I do think a warning message along the lines of:

    "DO NOT TURN THE IGNITION ON WITH THE FUEL PIPE DISCONNECTED"

    May have helped me to not paint the inside of the car with diesel..
    fq101.co.uk

  10. #10
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    Default Re: CDI fuel problem

    DO NOT TURN THE IGNITION ON WITH THE FUEL PIPE DISCONNECTED
    Incongruous with a diesel engine

    jus' sayin'
    fq101.co.uk

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