Gas Tank Repair

Same nuts bolts but I use a cement mixer I clamped a table to, or anyway you can fasten tank to mixer, I reposition onece to catch all sides.
 
You could try "electrolysis." All you need is a battery charger and some sodium carbonate. I use "Arm and Hammer" washing soda,which you can get at the grocery store. Ground to tank bottom, Positive to anode. I use 3/8 all thread for the anode. Don't let the rod touch the tank anywhere. A short piece of hose on the rod, at top and bottom works good. Roughly 4 tablespoons of soda per gallon of hot water for mix.
 
Dennis, yes, the rod goes directly in the "fill neck" of the tank. You'll
probably need about an 18" piece of all thread. On the bottom of the rod,
screw on a short piece of 3/8 heater hose or whatever, but let it hang past the
rod an inch or so, that way the rod can't touch the bottom of the tank when
resting on the bottom. At the top, just split a short piece long ways, (easier
to put on that way) and put it on the rod where it will lay against the fill
hole. You can "black tape" it if you want. Clamp the + cable to top of rod.
 
Forgot to add a small detail. Fill tank nearly all the way up with the "mix" so as to get as much rust as possible. It will bubble over anyway, so do it outside. My have to do it twice. Use a new rod each time. A couple or three hours each go.
 
I've been using Evapo-Rust lately. I never used it on a tank but you can plug the openings and put a gallon in and let it set on each side for a while. It rinses off with hot water and you can reuse it till it doesn't work any more. Non-toxic and biodegradable.
 
(quoted from post at 01:20:31 02/11/16) You could try "electrolysis." All you need is a battery charger and some sodium carbonate. I use "Arm and Hammer" washing soda,which you can get at the grocery store. Ground to tank bottom, Positive to anode. I use 3/8 all thread for the anode. Don't let the rod touch the tank anywhere. A short piece of hose on the rod, at top and bottom works good. Roughly 4 tablespoons of soda per gallon of hot water for mix.

Learned something new today!
 
I strap tank to rear wheel of tractor with nuts, small bolts, or small stones and take tractor out and use it. After that take the nuts, bolts, and stones out of tank and rinse with acetone then hot soap and water and let dry. After totally dry line it with a tank coating. I use Red-Kote but there are other that will do the same thing.
 
Is that different than baking soda, which is sodium bicarbonate? Also, do you have any idea what kind of reaction is going on in there? I mean is it reducing the iron oxide so it all comes loose from the good metal, or what? Very interesting in any case.
 
Ray, I went out and looked on the box. Ingredients contain sodium carbonate. No mention of bicarbonate. It works by drawing the rust off the tank walls to the anode, via electrical current. The rod will look like an old water heater element when finished. That's why you may need to do it a couple of times, using a new rod each time. Also, a bigger tank will probably need a longer cook time.
 

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