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Thread: Rail Pressure Spike?

  1. Top Of Page | #1

    Rail Pressure Spike?

    Hey y’all, got a 2015 2500 with MM3 and full delete.

    I’ve had 2 different tunes now and I get a rail pressure reading of 65k before starting every once in a while.

    It happens while glow plugs are warming up before I start it.

    Anyone else have this going on?


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  3. Top Of Page | #2
    Big Daddy! IGOTACUMMINS's Avatar

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    Re: Rail Pressure Spike?

    @Snakeeater14 who tuned it friend?

    "The grass is greener where you water it"


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  5. Top Of Page | #3

    Re: Rail Pressure Spike?

    First time came with the delete kit from company in Texas and now I have DRD but it happened with both.

    Maybe sensor going bad?


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  7. Top Of Page | #4
    Big Daddy! IGOTACUMMINS's Avatar

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    Re: Rail Pressure Spike?

    Let's ask @DRD?

    "The grass is greener where you water it"


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  9. Top Of Page | #5
    DRD's Avatar

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    Re: Rail Pressure Spike?

    This is probably just a misread.

    Rail pressure in reality can never go that high.

    Long as it reads normal while the engine is running, that's all that matters.

    Ray,
    Double R Diesel

    The Cummins Whisperer! John 3:16, Romans 10:9-10...Tuning for the Heart and Soul.


  10. Top Of Page | #6

    Re: Rail Pressure Spike?

    Thanks for the input! Yes it functions normally and reads fine while running and driving. Just reads 65k before start up about once a day and it’s always 65k and some change.


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  12. Top Of Page | #7
    cumminsdieselfreak's Avatar

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    Re: Rail Pressure Spike?

    Quote Originally Posted by Snakeeater14 View Post
    Hey y’all, got a 2015 2500 with MM3 and full delete.

    I’ve had 2 different tunes now and I get a rail pressure reading of 65k before starting every once in a while.

    It happens while glow plugs are warming up before I start it.

    Anyone else have this going on?


    Sent from my iPhone using Tapatalk
    It's just a misread and as stated, all that matters is what it reads while the truck is running.

    Also, Cummins doesn't have glow plugs, they have grid heaters instead.

    2018 Ram 2500 4x4 G56
    Romans 10:13

    See what we are up to on:
    FACEBOOK | INSTAGRAM
    Or Email me at:
    Joe@DudesDieselPerformance.com
    https://dudesdieselperformance.com/

  13. Top Of Page | #8
    Basic Member mud015's Avatar

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    Re: Rail Pressure Spike?

    I don't have an answer for you but I have just seen the same spike over 65,000 psi on my mm3 as well, tuned and full delete on a 14. every since tune it hangs after a full throttle run short or long pull then returns to normal. first time I all most pooped my pants. stepped on it and it still kept going nofoot on the throttle.


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  15. Top Of Page | #9
    Basic Member mud015's Avatar

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    Re: Rail Pressure Spike?

    Good morning sir, I am wondering is there a fail safe built in for extreme rail pressure spikes?

    At what pressure should one be concerned about injectors?


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  17. Top Of Page | #10
    InlineSix.7's Avatar

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    Re: Rail Pressure Spike?

    The fuel rail pressure relief valve is the safety net for over pressure conditions.


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    2012 Ram 2500 Laramie 4x4 Crew Cab shortbed 6.7 Cummins. RevMax built 68RFE "550" transmission w/ billet flexplate/low stall triple disc TC/direct oiling billet input shaft. 35"x12.50" Toyo Open Country tires on OEM 20" wheels, Thuren soft ride front springs, Thuren track bar, Fox 2.0 shocks, dual Bilstein 5100 steering stabilizer, Hellbent steering box brace, Caterpillar fuel filter/Donaldson water separator, ARP 425 head studs, MM3 tuner by DRD, Viair onboard air compressor, airlift 5k# rear airbags, V4 LED headlights, Kenwood head unit with TV's in the headrests for the kids

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