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really bad fuel mileage in a 12.7

Discussion in 'Trucks [ Eighteen Wheelers ]' started by bigguns, Mar 31, 2015.

  1. Mar 31, 2015 #1
    bigguns

    bigguns Road Train Member

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    Jun 13, 2013
    Omega,GA
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    My truck recently dropped dramatically in fuel mileage. Over time it has slipped from 6.5 to 5.9. The last two trips it has fallen to 4.7. CAC good, new fuel filters, new air filters, less than 2 years on a BW 171702 turbo, good fuel pressure (but I have it bumped up some). About 2 weeks ago I noticed that the fuel in the tanks has turned black. I was told that is very common to a Detroit. I thought maybe bad fuel so I started buying it elsewhere. Any thoughts anybody. Thanks
     
    bigguns, Mar 31, 2015
    bigguns, Mar 31, 2015
    #1
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  3. Mar 31, 2015 #2
    Lyle H

    Lyle H Road Train Member

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    Apr 16, 2014
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    You more than likely have asphaltines in your tank. Possibly algae . Treat with a biocide and keep plenty of fuel filters on hand.
    You may have to change them a couple times until you get rid of whatever one of those issues you have.
     
    Lyle H, Mar 31, 2015
    Lyle H, Mar 31, 2015
    #2
    JColt and bigguns Thank this.
  4. Mar 31, 2015 #3
    JColt

    JColt Bobtail Member

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    Lyle is probably correct. Just had this problem with our building generator at work last fall.
     
    JColt, Mar 31, 2015
    JColt, Mar 31, 2015
    #3
    bigguns Thanks this.
  5. Mar 31, 2015 #4
    Flatbedder73

    Flatbedder73 Medium Load Member

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    Dec 30, 2012
    Langhorne, PA
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    crap fuel......
     
    Flatbedder73, Mar 31, 2015
    Flatbedder73, Mar 31, 2015
    #4
  7. Apr 1, 2015 #5
    uncleal13

    uncleal13 Road Train Member

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    Humboldt, Sk
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    Also could be seals in fuel pump, lets engine oil into the fuel and gets returned to the tanks. Not sure that this would effect fuel economy though.
     
    uncleal13, Apr 1, 2015
    uncleal13, Apr 1, 2015
    #5
    bigguns Thanks this.
  8. Apr 1, 2015 #6
    EHB

    EHB Medium Load Member

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    Apr 26, 2011
    Newfoundland
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    Throw in a cup of javax in each tank and see what happens.
     
    EHB, Apr 1, 2015
    EHB, Apr 1, 2015
    #6
  9. Apr 1, 2015 #7
    bigguns

    bigguns Road Train Member

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    Omega,GA
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    Never heard of javax. What is it?
     
    bigguns, Apr 1, 2015
    bigguns, Apr 1, 2015
    #7
  10. Apr 2, 2015 #8
    heavyhaulerss

    heavyhaulerss Road Train Member

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    AL/TN BORDER
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    Is that the same thing I download on my computer? :biggrin_25523:
     
    heavyhaulerss, Apr 2, 2015
    heavyhaulerss, Apr 2, 2015
    #8
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