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Thread: Cleaning rusty gas tank

  1. #1

    Default Cleaning rusty gas tank

    For anybody that needs to clean out a gas tank, here is a tip that might help.
    I just got done cleaning the rust from the tank of my M715. It was pretty bad. Lots of goo and very thick rust. I cleaned the goo with lacquer thinner which I sloshed around and soaked overnight.

    For the rust, I used electrolysis to remove the rust. (I learned about on this BB) If you are not familiar with the process, it simply uses a solution of Arm and Hammer Laundry Soda and water which is energized with DC voltage (car battery charger) This process chemically breaks the bonds of the rust to the steel without damaging the base metal. The advantage of this process is that it removes the rust everywhere the solution touches. Because water fills every available nook-and-cranny, it removes rust in hard to get to places, (like the inside of a gas tank).

    I constructed an electrode inside the gas tank out of steel rebar suspended from the tank with closed cell foam. Filled the tank with the solution and connected it to DC voltage from my welder and let it boil for a few hours. When I was done, the tank was completely free of rust.

    Total cost for the project was about $10

    Follow this link for directions on electrolysis:
    http://antique-engines.com/electrol.asp
    http://myweb.tiscali.co.uk/andyspatch/rust.htm
    http://antique-engines.com/electrol-details.asp

  2. #2
    Join Date
    Dec 2003
    Location
    Giddings, Texas
    Posts
    7,729

    Default

    Pretty neat, thanks for the links.
    Remember if you didn't build it you can't call it yours.

    6.2 powered M715, 5 M1009's, M416, 2 M101's, 2 M105's, 3 M35's, M1007 6.5 turbo Suburban project called Cowdog.

    https://www.youtube.com/channel/UCCz...HGkBCfhXZ5iuaw

  3. #3

    Default

    Sounds like a great idea.

    How clean did you get the tank before you filled it with the solution?

    Did you put the positive connection on the rebar and the negative anywhere specific on the gas tank?

    Thank you for your help.

  4. #4

    Default

    Negative to the tank with a magnetic grounding device for a welder and the positive to the rebar grid inside the tank. I cleaned the tank with lacquer thinner.

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