KC9KAS: As the tank runs, the liquid foams up from the bubbles. That depletes the fluid in the tank. If it was submersed, the water would just run in from the outer tank as the foam floats out of the gas tank with the rust. I just topped it up every hour, but that was a royal pain. Next time, I'm going to put it in a tank like TD&H suggested. That will also let me clean the outside at the same time.
I ran it for 6 hours & rinsed it. Could have used a couple of more hours. Likely 8 total, as TD&H suggested. Anyway, I'm going to have it coated inside once it is painted. They'll do a final rust removal before they coat it. I was more interested in whether new pinholes would develop when it was cleaned. Luckily, none appeared. I've sprayed it with some Rust Check rust converter. Tomorrow I'll fill some small dents & prime it.
Edited by New.Canadian.DB.Owner, February 18, 2013 - 07:52 PM.