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Thread: Fuel Rail Pressure

  1. #1
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    Default Fuel Rail Pressure

    I noticed when data logging fuel rail pressure (actual and desired) at certain points the pressure reading jumps from 18000 psi to ~62000. This matches the corresponding desired fuel pressue. If I'm not mistaken the max for the Duramax is around 23000-24000 psi. All of this occurs when accelerating. Anybody have any ideas? It is possible I am doing something incorrectly since I am still learning / playing. This is on a stock tune.

    Dave

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    EFILive Distributor Trippin's Avatar
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    Quote Originally Posted by Dave Lewis
    I noticed when data logging fuel rail pressure (actual and desired) at certain points the pressure reading jumps from 18000 psi to ~62000. This matches the corresponding desired fuel pressue. If I'm not mistaken the max for the Duramax is around 23000-24000 psi. All of this occurs when accelerating. Anybody have any ideas? It is possible I am doing something incorrectly since I am still learning / playing. This is on a stock tune.

    Dave
    Any chance it's 6200 instead of 62,000?
    www.socaldiesel.com



    EFILive-DSP5......Switch your Attitude!
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    No, not that I can tell. The other values all appear to be correct (18000) but then it jumps when stepping on the pedal. At steady state everything goes back to around 22000-23000 psi. I was going to post a screen capture but I can't get it small enough to upload.

  4. #4
    EFILive Distributor Trippin's Avatar
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    Would you send me a copy of the log file?

    gtripp@earthlink.net


    www.socaldiesel.com



    EFILive-DSP5......Switch your Attitude!
    EFILive-CSP5......The Smart Way To Switch Your Cummins Tunes!
    EFILive-DSP4......Switch Your Colorado and Canyon Too!

  5. #5
    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by Dave Lewis
    No, not that I can tell. The other values all appear to be correct (18000) but then it jumps when stepping on the pedal. At steady state everything goes back to around 22000-23000 psi. I was going to post a screen capture but I can't get it small enough to upload.
    Dave, use - http://www.irfanview.com/ for capturing screen shots.

    I wouldn't mind seeing the logs too.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  6. #6

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    According to a friend of mine that works at the local big truck shop the duramax fuel rail pressure if you dead head the regulator can reach 80,000 + Psi. Like I said this is from a GM master tech who works on these things every day.
    Aaron L.
    Conover, NC

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    File sent. Ross I'll try that program in the future, Just something else I have to learn.

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    Lifetime Member GMC-2002-Dmax's Avatar
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    Was that the tune I sent you ????
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


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    No. It was my stock tune. I thought it was at first but I re-ran it. That reminds me it is with the Juice at 5/5 though (just bought normal gauges so I can pull the Juice). Not sure if thats where the problem is. Sorry for leaving that "small" piece of info out.

  10. #10
    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by Dave Lewis
    That reminds me it is with the Juice at 5/5 though (just bought normal gauges so I can pull the Juice).
    stackers need not apply

    I must confess I don't know enough about how the Edge 'modifies' the sensor data to/from the ECM, wait until it is gone before we look too close at log files.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

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