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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    A new emissions truck is your next move?? LOL. Yes I change my oil every 12-15k miles which is probably every 2-3 months. And this was the very first time it was black immediately afterwards. Im getting oil changed tomorrow and im try full synthetic. I just changed my filter yesterday when I got home. gonna run it about 100 miles before I get my oil changed and check it.
     
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  3. Bakerman

    Bakerman Road Train Member

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    The only place I can find it is at the TA in Coachella
     
  4. spsauerland

    spsauerland Road Train Member

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    If you are getting black smoke out the stacks, your oil will soot up and turn black faster because of the unburnt fuel entering the crankcase.
    ULSD is prone to having water in it. Can't remember it all, but many of solvents that used to be in diesel are gone and instead of water just passing with fuel in separates more easily and collects in tanks and fuel water separators. We started noticing it badly around 2010. We shock treat our bulk 12,000 gallon tank every quarter with Power Service tank cleaner Clear-Diesel Fuel & Tank Cleaner - Power Service , use power service biocide every half, and put Diesel Klean in every transport load. Has seemed to help .
     
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  5. nikmirbre

    nikmirbre Road Train Member

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    Just FYI, ive only ran about 600 miles since last week. I changed the fuel filter, didn't get around to changing the oil because its been raining. @spsauerland Im gonna take your advice and use that as soon as I get to running, which may not be until late next week or the week after. BTW, can you point me to an oil filter wrench for a 12.7?
     
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  6. jamespmack

    jamespmack Road Train Member

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    Seen tanks black as a barrel of oil. Injector orings seem to cause it more than fuel pump.

    Since 1997 I have change 3 detroit fuel pumps. Not known for failure. One worn out, one external leak. And one on my own truck because I was doing a complete overhaul. But it is possible.

    That's algae, alphaltine, or fuel lines coming apart.

    If it was combustion you will see bubbles in fuel tank.
     
  7. jamespmack

    jamespmack Road Train Member

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    I would also disassemble Davco and clean housing. Normally you have to order a lower oring ahead of time. That junk will hangout on the bottom if you drain it.

    If you add biokleen. Carry spare filters with you for a few weeks.
     
  8. nikmirbre

    nikmirbre Road Train Member

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    Yeah im gonna check fuel lines and such. Yea I went and bought a dozen last week.
     
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  9. Rideandrepair

    Rideandrepair Road Train Member

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    My tanks have bubbles. Very little, small bubble every 4-7seconds. Maybe only 3-4 seen at a time. Is that normal? Or enough to consider a problem?
     
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  10. jamespmack

    jamespmack Road Train Member

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    That's a tough call, if it runs fine with no problems I'd keep watching it.

    9/10 its going to be very obvious.

    But changing orings is cheap and simple.
     
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  11. jamespmack

    jamespmack Road Train Member

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    7 years on the fabric they claim. I just changed mine at 8 because I thought I found a small piece in filter. Better to be safe.
     
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