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Rust INSIDE gas tank. How do I remove it?

Discussion in 'Lawn Mowing' started by Navig8r, Dec 7, 2003.

  1. Navig8r

    Navig8r LawnSite Senior Member
    Messages: 477

    Bought a used (barely) snowblower, with a metal tank..... the tank was left empty and from condensation, is rusty inside.

    Does anyone have any ideas or suggestions on getting rid of this?

    BTW.. its an OLD machine, so finding a replacement tank would probably be inmpossible.
  2. KenH

    KenH LawnSite Bronze Member
    from CT
    Messages: 1,622

    I understand it is old, but is there any way to get a different poly tank to work???? Old metal tanks are tough.
  3. Lawn Tek

    Lawn Tek LawnSite Senior Member
    from u s a
    Messages: 457

    Drain fuel

    Put in some small stones , shake real good

    Use a product called " Kreem "

    Get at most motorcycle stores
  4. rtyus

    rtyus LawnSite Member
    Messages: 104

    A little sand mixed with the stones helps a lot. Just be sure to get it real clean.
  5. TRex

    TRex LawnSite Senior Member
    from DFW ,TX
    Messages: 487

    Can you post a pick of the tank. Maybe we can get a better idea of how to handle the problem. If it sits flat you might be able to have a new stainless steel tank fabbed up at a sheetmetal shop.
  6. o-so-n-so

    o-so-n-so LawnSite Bronze Member
    from Alabama
    Messages: 1,218

    Everyone is right on the mark. KenH has the best long term solution. Many of the homeowner brand riding mowers (murry, mtd,yard machine) have a square type poly tank. These are gravity feed so just mount it higher than the carb, install an in-line filter and a vented cap. A lot of these tanks have metal straps that hold them down and you could also use these straps in mounting it on your machine. A small engine repair shop is where I would start.

    Lawn tek's Idea sounds good if that kreem stuff puts a poly type coat on the inside of the tank.

    The others a good for a short term solution but the rust will be back next season. Make sure to install a quality see thru paper element inline filter so you can see the rust when it reappears.

    most of all.....Good Luck.
  7. Fvstringpicker

    Fvstringpicker LawnSite Fanatic
    Messages: 7,670

    You may try taking it to a radiator shop. They cleaned a metal tank for me
  8. tiedeman

    tiedeman LawnSite Fanatic
    from earth
    Messages: 8,745

    interesting some of these comments...I would have never thought of the sand idea. I usually just replace the tank if needed
  9. thill

    thill LawnSite Member
    Messages: 245

    You might want to look at this site. POR-15 is used in the car restoration market as well as marine applications.

    They have a products that will clean and stop further rust. They make a gas tank coating that will stop more from forming.

    It ain't cheap but it is darn good. Take a look at the link below.


  10. steinerguy

    steinerguy LawnSite Member
    Messages: 63

    I had to do this to a motorcycle that had been in storage for a long time.

    I used 50/50 blend of boric (swimming tool type?) acid and water into the empty tank. Let it sit for an hour or so, then rinsed it out. I had to do this 2 or three times to get the rust etched off the tank but it came clean. You can get the acid at a pool store, I got mine from the guy next door with a pool. But as always, be careful.


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