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Cat c12 fuel problem

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

Page 2 of 2
  1. May 9, 2019 #11
    Tombstone69

    Tombstone69 Road Train Member

    1,010
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    Dec 20, 2018
    Jersey shore
    0
    Make sure you have the right voltage going to the ECM, anything less than 12v is NG. Had the same problem with my 12.7DD, oxidation on the fuses, replaced them, no problem. Just a thought.
     
    Tombstone69, May 9, 2019
    Tombstone69, May 9, 2019
    #11
    swaan Thanks this.
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  3. May 11, 2019 #12
    raferko

    raferko Bobtail Member

    22
    6
    Oct 23, 2018
    Japan
    0
    I get 28v to the ECM lol everything’s fine, even if it was low it wouldn’t effect mechanical fuel pressure while running, even cranking fuel pressure without an ECM even connected would give me at least 70 psi
     
    raferko, May 11, 2019
    raferko, May 11, 2019
    #12
  4. May 11, 2019 #13
    swaan

    swaan Road Train Member

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    Jul 12, 2009
    BC canada
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    I'm sure he knows that ecm voltage doesn't effect fuel pressure. Dont be so condescending.when people are just trying to help you...... he was obviously just giving you another option that can give you the same symptoms your exsperiancing.

    28 volts you say???? Wow! That's one special electrical system you got there.

    Have you checked your suction lines yet like others have suggested??
     
    swaan, May 11, 2019
    swaan, May 11, 2019
    #13
    spsauerland Thanks this.
  5. May 11, 2019 #14
    raferko

    raferko Bobtail Member

    22
    6
    Oct 23, 2018
    Japan
    0
    Yes, the c12’s and c15’s I work on all run on a 24v system so we have some beefy alternators, and yes I’ve ran fuel from a bucket to bypass the tank
     
    raferko, May 11, 2019
    raferko, May 11, 2019
    #14
  7. Apr 29, 2022 #15
    Canary379

    Canary379 Light Load Member

    73
    3
    Apr 13, 2012
    Illinois
    0
    So I’m curious as too what the problem ended up being? I am having the same issue now with my engine. Thanks
     
    Canary379, Apr 29, 2022
    Canary379, Apr 29, 2022
    #15
  8. Oct 3, 2025 #16
    C12dolphin

    C12dolphin Bobtail Member

    9
    1
    Oct 3, 2025
    0
    I have a c12 that is doing this also have you ever figure out what is wrong or what you did to fix it
     
    C12dolphin, Oct 3, 2025
    C12dolphin, Oct 3, 2025
    #16
  9. Oct 3, 2025 #17
    C12dolphin

    C12dolphin Bobtail Member

    9
    1
    Oct 3, 2025
    0
    Where you able to figure yours out I have one that’s doing the same thing right now and can’t seem to figure it out
     
    C12dolphin, Oct 3, 2025
    C12dolphin, Oct 3, 2025
    #17
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