Gunk in diesel fuel tanks

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by ichudov, Apr 12, 2022.

  1. ichudov

    ichudov Heavy Load Member

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    I have a peterbilt where, it seems, water made it to the tank and now the tanks have plenty of "gunk", sticky stuff like chewing gum stuck to the bottom of the tank.

    Any idea how to clean that out, thanks, I can take tanks off if necessary.
     
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  3. cke

    cke Road Train Member

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    Drain plug maybe.
     
  4. Dino soar

    Dino soar Road Train Member

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    I used aluma bright cleaner in my tank.

    I filled up the tank halfway and I think I put the whole gallon into the tank and let it slosh around for a couple days while I drove.

    It did a good job but I should have I left it in there for a few more days. It would have made the inside of that tank super clean.

    And it is biodegradable so all you have to do is take the plug out from the bottom of the tank and it can run right on the ground no problem.

    Drain the tank out first and flush it well before you do that.
     
  5. ichudov

    ichudov Heavy Load Member

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    This gunk does NOT flow. It is sticky. Does this aluma bright cleaner dissolve it?
     
  6. Dino soar

    Dino soar Road Train Member

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    What is in your tanks is algae. I had a really bad algae problem that destroyed my fuel pump.

    Alumabrite is the same aluminum treatment that they use on the trailers to get them bright.

    It is not made specifically for the algae but it's kind of like an abrasive that as it sloshes back and forth it will break that down.

    You may need to add more than I did or leave it in longer. Maybe just fill your tank up a third of the way instead of a half.

    I should have done mine again and probably added more because it definitely cleaned it but there still was some there. The only problem that I have now is that I have to change my fuel filter a little more often because whatever is left in there the filter is catching.

    But as you drive around the sloshing will start to break that up. Initially if you have something that you can reach down in through the tank hole and scrape around the tank that would help.

    You could have somebody cut the end of the tank off and clean it and reweld the tank but at that point you probably better off just buying new tanks.

    There also is an algae treatment that you can add into the tank but the problem with that is that it will break that up but it'll keep getting caught in your fuel filters then you'll have to change them pretty often until the algae works its way out.
     
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  7. Cattleman84

    Cattleman84 Road Train Member

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    Is it dark green, brown, or black? If so it could be algea. They make a product specifically for killing and breaking down algea in diesel... Can't remember what its called right now.
     
  8. little cat 500

    little cat 500 Road Train Member

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    couple gallons of gas will work as well
     
  9. W923

    W923 Road Train Member

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    Second on the gas
    I have been a firm believe in gas to clean diesel tanks ever since dad’s hired man put it in my 950 loader
    Thankfully there was enough crud in the tank and it broke loose fast enough to plug the filter before enough gas got into the fuel system to cause serious damage. From what the guy told me it must have worked really fast because I was pretty sure the pump had siezed from what I was told. I think it was probably about 90 percent gas because it was pretty low on fuel. I would disconnect that tank and put some gas in there and drive around for a couple days then drain and rinse with diesel fuel once or twice. Probably the cheapest solution but sadly it’s not cheap anymore.
     
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  10. Cat sdp

    Cat sdp . .

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  11. ichudov

    ichudov Heavy Load Member

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    This peterbilt has big tanks, but they are almost empty. A couple of inches on the bottom.

    Should I put a gallon of gasoline into each tank and wait a week?

    I am not planning to start ot drive this peterbilt for now and I will drain both tanks, power wash them and dry them out before putting new diesel in.
     
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