Fuel Pressure Problems N47D20A
Results 1 to 1 of 1
  1. #1
    BFI Noob
    BMtroubleu's Avatar
    Join Date
    Oct 2015
    Location
    Burleigh Heads QLD.
    Posts
    11
    Car Specs:
    Year
    2008
    Model
    E83
    Engine
    N47
    Fuel
    Diesel
    Thanks
    1
    Thanked 1 Time in 1 Post


    Donate Please click the
    image to support
    BMWForums.info
    Click Here To Contribute To Our Site

    Fuel Pressure Problems N47D20A

    I have had unbelievable fuel pressure problems in my 2008 E83 / N47D20A over the past several months due to use of a new chemical based fuel additive which I tried.
    The end result has been two high pressure fuel pumps destroyed, the second due to the idiot who blew the feed line backwards through the filter, exploding it and all thecontamination into the fuel tank and leaving the system without any protection (undetected). After the second new pump was fitted along with a new filter, it continued tohave filter blockage problems so I cut open the original filter which I had collected and found the reason for the disaster. After two further filter blockages, I have had to remove the fuel tank, drain and flush it and both feed and return lines and put in fresh uncontaminated fuel with another new filter. I am now confident that all contamination has gone and the engine is running well with no red dash warning lights but I am still getting an amber DDE light every few days with a new message on my analyser of"Plausibility of pressure readings" on both the high and low pressure sides of the circuit. This fault light goes off when the engine is stopped and may not return until several days later. I am at a loss as to the cause so I need to get hold of information as to exactly what these pressure readings should be and any special criteria applying to the test procedure. Please note that the rail pressure sensor and bypass solenoid have also been replaced and the rail and injector lines cleaned. Can anyone with experience or access to information help me with the high & low pressure readings that the DDE is expecting & the relevant RPM's, idle etc. This could as simple as taking fuel pressure readings on your analyser of any healthy N47D20A 177 hp. engine around this vintage as used in any of the BM model range so I can compare to find my problem or know where I can look them up.
    Last edited by BMtroubleu; 07-08-2017 at 15:59. Reason: to make clearer

User Tag List

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •