Black fuel filter(pics included)

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

  1. 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.
     
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  3. 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.
     
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  4. nikmirbre

    nikmirbre Road Train Member

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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.
     
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  5. Ross_Tech

    Ross_Tech Light Load Member

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    Ah. Well then there is an issue. Check out this video.
     
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  6. 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.
     
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  7. 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
     
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  8. 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.
     
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  9. 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!
     
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