Black fuel filter(pics included)

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by nikmirbre, Aug 9, 2021.

  1. nikmirbre

    nikmirbre Road Train Member

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  3. jason6541

    jason6541 Road Train Member

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    More then likely algae, look in tanks with flashlight and look for black slime inside tanks. Summertime and condensation and this #### biodiesel feeds the algae.
    Cummins also known for asphaltine
    Cut filter open and see if slimy or gritty. If slimy then get some diesel kleen and carry a few extra filters. If not algae and a Cummins check with Cummins on a product to clean fuel system
     
  4. nikmirbre

    nikmirbre Road Train Member

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    2016 w900 12.7 Detroit. I don't see any dark fuel in my tanks from what I can see. My filters ave been looking like this for about 2 months.(each time I change them). Only issue I know on the truck is the exhaust manifold....I can see exhaust(very little)..it appears it coming from where the manifold gasket may be broken. I don't think the manifold is leaking though.

    I changed my oil on 6-1 and I noticed my oil was pretty dark. But when the tech went to show me that he filled the dipstick the oil which is usually brown was very dark still. I questioned whether he put used oil in there it was so dark lol.

    I got an engine tune back in the middle of April was the only change ive done. I don't notice any performance issues. More black smoke of course and since the tune ive never gotten good fuel mileage anyways since I pull heavy haul.
     
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  5. jason6541

    jason6541 Road Train Member

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    Well hell you have some cross contamination for sure.
    Overhead done correctly, do you have an injector streaming. Also sounds like oil is passing into fuel system from pump. Been awhile since messing with 60 series. I would recommend checking fuel pump as well doing a oil sample. May find high fuel dilution.
     
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  6. nikmirbre

    nikmirbre Road Train Member

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    I changed that filter this afternoon and forgot to cut it like you mentioned. So I just went out and cut it and its not slimy....(its been sitting in my to car for a few hours if that makes any difference)
     
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  7. nikmirbre

    nikmirbre Road Train Member

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    Yes ive poured some diesel keen in there this morning. I purchased some biocide and it'll be here wednesday I think. None of local places had any.....
     
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  8. nikmirbre

    nikmirbre Road Train Member

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    12.7 has virtually no place for oil to transfer into fuel.
     
  9. nikmirbre

    nikmirbre Road Train Member

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    I don't exactly know the order of how things flow but, my fuel tanks seem to be fine. The fuel is the same color as far as I can see. I have an anti theft fuel thingy(lol) that makes it hard to look down in there
     
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  10. jason6541

    jason6541 Road Train Member

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    True on a 60 series. Curious though if you could be getting soot into fuel system from injectors letting combustion gases get by?. If I recall don’t the 60 series have copper crush washers in the injector bores in the head. Cylinder psi is high that would allow some gases to get in fuel system. Only place I know to look really
     
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  11. nikmirbre

    nikmirbre Road Train Member

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    When you say "combustion gases getting by" is that another way of sayin my injector is leaking? That was my thought. As I thought that or the algae......
     
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