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N14 very hot fuel return

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Rock hauler, Mar 12, 2011.

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  1. Mar 12, 2011 #1
    Rock hauler

    Rock hauler Light Load Member

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    Nov 26, 2008
    Deridder La.
    0
    friend has 2000 N14 had ecm tune in houston and dyno, 600 HP at wheels. ran great for 2 or 3 months and started losing power and noticed fuel return was very hot, dosen't have a temp gun, just much hotter than normal, they took all the check valves out and what ever is on a cummins return line so it has no restriction, didn't help. I thought he might not know how hot they get but he said first thing in the morning within 2 miles return line will be so hot you can't touch it. Thanks for any ideas
     
    Rock hauler, Mar 12, 2011
    Rock hauler, Mar 12, 2011
    #1
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  3. Mar 13, 2011 #2
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    up to 60-70 dgr c
     
    Pablo-UA, Mar 13, 2011
    Pablo-UA, Mar 13, 2011
    #2
  4. Mar 13, 2011 #3
    K-D

    K-D Bobtail Member

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    Dec 25, 2010
    Roy Wa
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    I know this seems to simple, but has he changed the fuel filters?
     
    K-D, Mar 13, 2011
    K-D, Mar 13, 2011
    #3
  5. Mar 13, 2011 #4
    heavyhaulerss

    heavyhaulerss Road Train Member

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    AL/TN BORDER
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    English please. :biggrin_25521:
     
    heavyhaulerss, Mar 13, 2011
    heavyhaulerss, Mar 13, 2011
    #4
  7. Mar 13, 2011 #5
    Rock hauler

    Rock hauler Light Load Member

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    Nov 26, 2008
    Deridder La.
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    I didn't ask, but most of us change all filters when we change oil at 10000 miles so mast likely yes, but haven't thought that direction might check fuel lines coming apart inside.
     
    Rock hauler, Mar 13, 2011
    Rock hauler, Mar 13, 2011
    #5
  8. Mar 13, 2011 #6
    Pablo-UA

    Pablo-UA Road Train Member

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    Borispol, Ukraine
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    140-160 dgr....
     
    Pablo-UA, Mar 13, 2011
    Pablo-UA, Mar 13, 2011
    #6
    112racing Thanks this.
  9. Mar 13, 2011 #7
    melpromud

    melpromud Medium Load Member

    463
    114
    Jan 29, 2010
    camden ny
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    We have a 2000 n-14 and the return fuel is hot all the time and is a box stock 370 hp. Im not sure of the actual temp. but it gets hot enough to not only melt the snow off the tanks but turn it to steam and keep the tanks completly dry on the out side even if its still snowing. Tanks are very warm to the touch. Im not sure what the warmest temp you can keep your hand on but its close to thet temp. Never felt the return line but I bet if the tanks are this warm the line is hot. Its nice on thoes below zero mornings. You know your fuel wont jell up.
     
    melpromud, Mar 13, 2011
    melpromud, Mar 13, 2011
    #7
  10. Mar 13, 2011 #8
    Inland-Pilot

    Inland-Pilot Light Load Member

    229
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    Jun 23, 2010
    Jackson, Ms
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    Cummins to my knowledge never built a 675-700 HP N14 (has to be that much if he's getting 600 to the ground) so if I was the owner I'd take it back over yonder, park it under that shade tree and tell whomever installed that melt-down kit into his ECM/injectors/turbo/pistons (bcoz all that would need to be changed to get 600 HP to the ground) to fix it... oh btw, I've got an M11 Cummins that's putting 575 HP to the ground. bahahaha
     
    Inland-Pilot, Mar 13, 2011
    Inland-Pilot, Mar 13, 2011
    #8
  11. Mar 13, 2011 #9
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    Check for loss of fuel pressure. Sounds like the pump is weak. With reduced fuel pressure you will loose power and the fuel flow is slower so it will absorb more heat
     
    Heavyd, Mar 13, 2011
    Heavyd, Mar 13, 2011
    #9
  12. Mar 13, 2011 #10
    canuck in da truck

    canuck in da truck Road Train Member

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    Aug 6, 2010
    western pa
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    i dont know all that much about cummins--more of a detroit person---but i dont think return fuel would really have pressure on it would it??
    i am going to say its normal for the the fuel return to be hot
     
    canuck in da truck, Mar 13, 2011
    canuck in da truck, Mar 13, 2011
    #10
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