Primary fuel filter

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by spindrift, May 20, 2022.

  1. spindrift

    spindrift Road Train Member

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    So I found this "stuff" packed around the inlet ports of my fuel filter. I've never, ever seen anything like it before. Only difference is that my last filter change was done by a TA newbie. It almost has the consistency of caulk. The heated fuel definitely has had an affect on it. Any ideas?

    20220520_191646.jpg 20220520_191654.jpg
     
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  3. kranky1

    kranky1 Road Train Member

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    Caulk eh. Pipe dope maybe? Have you looked up into the filter head to see if there’s any around the threads? Doesn’t really matter what it is it shouldn’t be there. Almost had to have come from somewhere between there and the water separator. Can’t see any of that going through one, it almost had to come from somewhere downstream of the separator.
     
  4. spindrift

    spindrift Road Train Member

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    Interesting. Maybe the kid removed the threaded insert that screws into the center of the filter head and put something on the threads.

    The first and only time I've had someone do the filter change.
     
  5. Another Canadian driver

    Another Canadian driver Heavy Load Member

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    The first and last time I've had someone do the filter change.
    Fixed it for you.
    You are welcomed.
     
    spindrift Thanks this.
  6. Rideandrepair

    Rideandrepair Road Train Member

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    Insides of fuel lines coming apart? Usually looks all black, more consistent. That looks like rat poop.
     
  7. spindrift

    spindrift Road Train Member

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    All new fuel lines. Actually, looks like a lot of ear wax plugs that came from a kid I knew in school. :eek:
     
  8. AModelCat

    AModelCat Road Train Member

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  9. spindrift

    spindrift Road Train Member

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    LOL, I don't snack while I'm fillin'.
     
  10. North Pole Nightmare

    North Pole Nightmare Light Load Member

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    Some fuel has a little tar or asphalt in it.When the fuel is heated it separates and ends up like this.
     
  11. mtoo

    mtoo Road Train Member

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    I would cut the filter open and see how much was in the pleats. Also check the walls and bottom of fuel tank. I'm going to go with asphaltene if it was algae it would be slimy. All it takes is one fill up from a contaminated storage tank with no filters at the pump to give you months of headaches
     
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