N13 high fuel pressure ongoing issues

Discussion in 'International Forum' started by Bikermonkeh, Jun 10, 2020.

  1. Bikermonkeh

    Bikermonkeh Bobtail Member

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    Aug 15, 2019
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    I have a 2014 prostar with n13 I need help with. Nobody, including international, can find this problem. I get spn 3055 fm0 and fm17. I also get spn 157 fm0 and 14. I also get a funny noise like a restriction or air bubbles (like sucking on a straw too hard). I have already replaced the fuel rail pressure relief valve, checked grounds, replaced fuel filters and checked lines. Fuel system cleaner seemed to be making improvements but today I noticed that the fuel pump is leaking diesel like crazy. I already ordered a new pump but I would like some insight on this issue as to whether or not a leaky pump could cause high pressure (air bubbles) or if there is another problem that like to hide on these before i blow up a new pump. Any advice (other than "buy another truck") would be greatly appreciated.
     
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  3. Heavyd

    Heavyd Road Train Member

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    99% of the time, with the 3055 codes, your fuel pump is wearing out. Due to the noise and other codes, I wonder if you have some sort of aeration or return restriction problem. Restricted return will cause over pressure issues, so make sure it is ok. Max allowable return pressure is 13 psi.
     
    Erik Blazer Thanks this.
  4. Bikermonkeh

    Bikermonkeh Bobtail Member

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    Thanks heavy d. The return pressure has been checked, at one point it was diagnosed at the dealership which is when I had the relief valve put in. I'm just hoping that the leaking pump was sucking air, it is definitely acting up way worse with the same codes since it starting leaking lots of fuel. Once the new pump is in I'll see if I can get codes to pop and update. This has been a great truck but the pump causing too much pressure is just bazaar and has been fairly costly to find. As an old auto and motorcycle tech I was looking everywhere else. Oops.
     
  5. Heavyd

    Heavyd Road Train Member

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    Once the fuel pump starts to get weak, it has to command more and more of the fuel pressure control valve to keep the pressure up. Once fueling demand lowers, it takes the pump a second to catch up but since the fueling command was so high, the pressure spikes before it comes back down. This is how the pressure codes are logged and in severe cases, like yours, trip the relief valve too.
     
    Erik Blazer and Bikermonkeh Thank this.
  6. Bikermonkeh

    Bikermonkeh Bobtail Member

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    That sounds about right for how it's acting
     
  7. Al can 67

    Al can 67 Bobtail Member

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    May 31, 2017
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    U got a,restriction in the line, like air or it's gummed up
     
  8. Al can 67

    Al can 67 Bobtail Member

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    Poor fuel quality and,dirt in tank can cause fuel pressure,problems as well ,tell him to use a fuel catalyst
     
  9. Al can 67

    Al can 67 Bobtail Member

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    Or could be as,simple as clogged fuel filter
     
  10. Bikermonkeh

    Bikermonkeh Bobtail Member

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    Aug 15, 2019
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    I don't ever put anything but good diesel in my tanks, the tanks are clean and the fuel filters have been changed a couple times. The lines and return pressure have both been checked on more than one occasion, however, they did have a brittle line break removing the pump. That could've been another issue I suppose but it does appear the pump was the entire issue. Probably sucking air before it started noticably leaking. Either way, it's running smooth and quiet, even better than ever at idle and all throughout the band. I need to find a trailer still, but I could get it to pop codes by putting the spurs to it and getting the rpm's up and it's running flawless with no codes coming up. Thank you guys for the responses. I have peace of mind this thing is finally fixed. Next time this sort of thing happens I'll be looking at that pump sooner than later. It's expensive but so is screwing around with it for months!
     
    QUALITYTRUCK and Heavyd Thank this.
  11. Al can 67

    Al can 67 Bobtail Member

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    Bad fuel ,dirt, older lines almost anything can cause a fuel problem ,need yo keep entire fuel and dpf system clean
     
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