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Help,coolant in fuel

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Bubba Racing, Aug 17, 2011.

  1. Aug 17, 2011 #1
    Bubba Racing

    Bubba Racing Bobtail Member

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    Jun 6, 2010
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    Got a Mack Titan E7-427 that is putting coolant into the fuel. Disconnected the coolant lines to the fuel heater, but coolant is still getting into the fuel. Where else might it be getting there from? It is losing about a gallon of coolant a day. Thanks in advance.
     
    Bubba Racing, Aug 17, 2011
    Bubba Racing, Aug 17, 2011
    #1
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  3. Aug 17, 2011 #2
    titus1

    titus1 Bobtail Member

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    Jun 6, 2011
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    Im not trying to sound sarcastic at all so please don't get offended but how are you sure that the coolant is getting into the fuel?
    It's been a while since I pulled apart an E7 but Im pretty sure the injectors go through a coolant passage so It might just be an injector or o-rings.
     
    Last edited: Aug 17, 2011
    titus1, Aug 17, 2011
    titus1, Aug 17, 2011
    #2
  4. Aug 17, 2011 #3
    Heavyd

    Heavyd Road Train Member

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    I am not sure of Mack, but most engines have coolant cooled injector cups. When they leak you will get coolant into the fuel.
     
    Heavyd, Aug 17, 2011
    Heavyd, Aug 17, 2011
    #3
  5. Aug 17, 2011 #4
    Bubba Racing

    Bubba Racing Bobtail Member

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    Jun 6, 2010
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    Yes I am sure, anti-freeze in the separator. I'm not sure either about the injector passing thru a coolant passage. I've yet to have one of these apart. The fuel passes thru the ECU cooling plate, is there coolant there as well? I haven't looked into it that far yet. Thanks.
     
    Bubba Racing, Aug 17, 2011
    Bubba Racing, Aug 17, 2011
    #4
  7. Aug 18, 2011 #5
    STisma

    STisma Bobtail Member

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    Aug 17, 2011
    Midwest
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    Based on what you wrote.....
    IMO .....
    Most likely the culprit is the injector o-rin(s).
    Bad injector cups would cause other problems.
    No coolant near ECM....the fuel is cooling ECM.
     
    STisma, Aug 18, 2011
    STisma, Aug 18, 2011
    #5
  8. May 4, 2022 #7
    Dartdaddy68

    Dartdaddy68 Bobtail Member

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    May 4, 2022
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    Did you ever find the remedy for this?
     
    Dartdaddy68, May 4, 2022
    Dartdaddy68, May 4, 2022
    #7
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