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Black fuel filter(pics included)

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

Page 6 of 6
  1. Sep 6, 2021 #51
    Ross_Tech

    Ross_Tech Light Load Member

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    It's normal. I've never seen a used diesel filter that wasn't black. The fuel in the bowl would look black if it had oil or contaminants in it.
     
    Ross_Tech, Sep 6, 2021
    Ross_Tech, Sep 6, 2021
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  3. Sep 6, 2021 #52
    Rideandrepair

    Rideandrepair Road Train Member

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    That’s a good point. I had a canister type fuel/water separator with the plastic bowl on bottom. That thing got nasty, sometimes like black mud. Drain was useless, as it would get plugged.
     
    Rideandrepair, Sep 6, 2021
    Rideandrepair, Sep 6, 2021
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  4. Sep 6, 2021 #53
    nikmirbre

    nikmirbre Road Train Member

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    High Point NC
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    mine have never came out looking like that......It all started sometime in May. The fuel in the bowl does look black.
     
    nikmirbre, Sep 6, 2021
    nikmirbre, Sep 6, 2021
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  5. Sep 7, 2021 #54
    Ross_Tech

    Ross_Tech Light Load Member

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    Ah. Well then there is an issue. Check out this video.
     
    Ross_Tech, Sep 7, 2021
    Ross_Tech, Sep 7, 2021
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  7. Sep 7, 2021 #55
    nikmirbre

    nikmirbre Road Train Member

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    Yeah mine is not that black at all...... And from what I can see my fuel tanks aren't black either..... I just dropped truck off at mechanics. Of course ill update when I know something.
     
    nikmirbre, Sep 7, 2021
    nikmirbre, Sep 7, 2021
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  8. Sep 10, 2021 #56
    Nss

    Nss Light Load Member

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    Running fuel tanks low in hot weather can cause this, hot return fuel strips the interior of aeroquip style lines and ends up in the tank
     
    Nss, Sep 10, 2021
    Nss, Sep 10, 2021
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  9. Sep 18, 2021 #57
    nikmirbre

    nikmirbre Road Train Member

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    Well I picked my truck up Tuesday. I went ahead and had all the injectors changed and changed all of the fuel lines. I changed the fuel filter yesterday after driving about 1100 miles since Wednesday. Fuel was looking good. It wasn't very black to begin with but, it was a lot clearer. I drained the fuel enough to wipe the old blackness from the sides of the bowl.

    When I drained the bowl the initial fuel that came out wasn't dark at all. I didn't bother having him test the injectors because I wanted them to replace them as a precaution anyways. Ill change the fuel filter at the end of the week and update.
     
    nikmirbre, Sep 18, 2021
    nikmirbre, Sep 18, 2021
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  10. Sep 21, 2021 #58
    nikmirbre

    nikmirbre Road Train Member

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    Drained a bit of fuel today and its looking all good so far!!!!! Since Saturday ive driven about 700 miles. Normally it'd be a little dark by now, but nothing to report but good news!
     
    nikmirbre, Sep 21, 2021
    nikmirbre, Sep 21, 2021
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