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Discussion Starter #1 (Edited)
64 BobcaT 820

Just bought a Bobcat 820 1964 (Briggs and Stratton - 10000 model series) , which has been sitting around for awhile as its pretty stuck up. There was a 3/4 full tank of gas that looked like thinned down molasses when I siphoned it out and then a lot of black bits that I think were rust. ( tablespoon full minimum) . The side walls of the tank seem to be the worst, having a surface like very coarse sandpaper. In order to clean out this what I thought I could do... maybe?...all input appreciated}
I have small mixer so thought I'd fill empty tank about 1/3 full of a clean gravel mix, then fix the tank solidly too the inside of the mixer and let spin for an hour or two and this should grind off some of the outer layer of rust. Then rinse tank and fill it with a 1:6 mix of molasses and water and immerse completely for awhile to dissolve all the rust. I've tried molasses mix before and it cleans off rust even cleaner than sand blasting... but is slow. Really clean metal will rust again very quickly, so I was wondering if there was something that coats the inside of the tanks. I put startron in the gas of all my small engines but that I think is more of a solvent that keeps the gas from gumming up the carburetors.
 

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I've never usex it but there is a'product called creme that is supposed to coat'old tanks.
That thing is a beast you need to enter on the oldest blower thread.
 

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I have heard of people putting rocks or nuts in the old tanks and maybe some diesel and then shaking them violently or doing something like wrapping them in towels and them putting them in a clothes dryer or rock tumbler. Obviously you can't use fuel in the dryer.

I have heard of guys using Red Kote to seal the tanks after wards, I have never had to clean or seal one yet.
 

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if you have a automotive battery charger and an old plastic bucket you and use electrolysis. here are a couple of videos
 

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I used to de-rust a lot of old M C tanks. What I used was Lysol toilet Bowl cleaner..not the thick blue stuff, just the plain cheapo Lysol TB cleaner. Plug the outlet hole, and pour the bottle in. Rotate it around slowly every 5-10 min's untill it's clean then drain and flush with water and dry it out with the blower end of a shop vac. Pour in gas tank liner should be available from most MC dealers, it works well if you follow the directions.
 

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Discussion Starter #8 (Edited)
the plan

I think I can improve cleaning my tank if I use nuts in the mixer as they would have more impact and leave less residue. Also, I have a battery charger so electrolysis would an interesting process to try and maybe use it for more than just the tank. Years ago I picked up a quite old outboard motor, (Johnson 3hp) that I still have. It had a cork float in the carburetor that had started soaking gas and would flood the motor. I talked to the mechanic at the local marina and he told me to dry it out, sand very lightly, clean and give it a couple coats of shellac. Apparently this was how small carburetors were sometimes made. I even wondered if gas tanks were ever given a coating of shellac. I think now days that with new gas and additives it would not work.

Thanks all for your input & Merry Christmas
 

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Discussion Starter #9
I used to de-rust a lot of old M C tanks. What I used was Lysol toilet Bowl cleaner..not the thick blue stuff, just the plain cheapo Lysol TB cleaner. Plug the outlet hole, and pour the bottle in. Rotate it around slowly every 5-10 min's untill it's clean then drain and flush with water and dry it out with the blower end of a shop vac. Pour in gas tank liner should be available from most MC dealers, it works well if you follow the directions.
I'll try the Lysol after the nuts and before I try the Electrolysis. Thanks
 
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