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Cat c12 fuel problem

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by raferko, May 9, 2019.

Page 1 of 2
  1. May 9, 2019 #1
    raferko

    raferko Bobtail Member

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    Oct 23, 2018
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    okay so I have a c12 with a fuel problem, it runs rough/sounds like it has a miss almost and is low on power, the fuel filter and water separator are new. I’ve replaced the filter housing as well so it rules out the regulator in there, the transfer pump has also been replaced and the fuel is clean, I’m stumped. Am I missing something here, is there another check valve somewhere on the head/fuel rail. Also at idle and high idle which is 1500 rpms I’m getting 40-no more than 50 psi of fuel pressure and it moves around in that range a lot like jumps around, and when I hear the engine slightly bog down is when it hits 40, finally there are no codes of any sort in CAT ET and all the injector solenoids tested out good and I also did a cylinder cutout test, any help would be appreciated.
     
    Last edited: May 9, 2019
    raferko, May 9, 2019
    raferko, May 9, 2019
    #1
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  3. May 9, 2019 #2
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Do you have a fuel restriction gauge?
     
    spsauerland, May 9, 2019
    spsauerland, May 9, 2019
    #2
  4. May 9, 2019 #3
    raferko

    raferko Bobtail Member

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    Oct 23, 2018
    Japan
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    No?¿
     
    raferko, May 9, 2019
    raferko, May 9, 2019
    #3
  5. May 9, 2019 #4
    Intothesunset

    Intothesunset Road Train Member

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    From what I've heard about C12 CAT engines is they can go bad in many ways. Rebuild them and 1 week later they are scrap.
    The worst CAT engine ever, and replace it with a C13, I hear often.
     
    Intothesunset, May 9, 2019
    Intothesunset, May 9, 2019
    #4
  7. May 9, 2019 #5
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Pretty bad advice.
     
    spsauerland, May 9, 2019
    spsauerland, May 9, 2019
    #5
    Magoo1968, A5¢ and wore out Thank this.
  8. May 9, 2019 #6
    spsauerland

    spsauerland Road Train Member

    4,296
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    May 31, 2010
    West Harrison, In
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    To make fuel pressure, you need fuel. Need to plumb in a sight glass to see if you are sucking air and how old are your suction and return hoses? Could have a collapsing or restricted hose.
     
    spsauerland, May 9, 2019
    spsauerland, May 9, 2019
    #6
    wore out, Diesel Dave and swaan Thank this.
  9. May 9, 2019 #7
    swaan

    swaan Road Train Member

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    More truck stop coffee counter B.S.!
     
    swaan, May 9, 2019
    swaan, May 9, 2019
    #7
    A5¢, wore out and Intothesunset Thank this.
  10. May 9, 2019 #8
    swaan

    swaan Road Train Member

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    I'm with the sucking air or restriction idea as well.
     
    swaan, May 9, 2019
    swaan, May 9, 2019
    #8
    spsauerland Thanks this.
  11. May 9, 2019 #9
    Intothesunset

    Intothesunset Road Train Member

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    Is C12, or C13 the problem child? I may have gotten it backwards.
    Or it's just bad advice on all accounts, and C12, and C13 are both reliable engines?
     
    Intothesunset, May 9, 2019
    Intothesunset, May 9, 2019
    #9
  12. May 9, 2019 #10
    wtokhi

    wtokhi Light Load Member

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    Nov 3, 2017
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    Idk where
    idk where u get ur info from but c12s are one of the best engines, we have one in our fleet that has been running since 2009 after a rebuild with no problems at all since
     
    wtokhi, May 9, 2019
    wtokhi, May 9, 2019
    #10
    Canary379 and Intothesunset Thank this.
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