SOHC.co.uk Forums > CB500/550

de rust a petrol tank

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mickwinf:
my 500 has got lots of crud getting through to the carbs causing blockages. I have cleaned tank and it is pretty good inside except for the seams and the odd spot of rust. I have read that vinegar will dissolve rust but is this true? or any other method that is proven to work. I don't think it is bad enough to need a sealant so look forward to your ideas.

hairygit:
A cheap brand of cola drink in the tank and left overnight. It contains phosphoric acid, which converts iron oxide (rust) into iron phosphate, a hard black inert material, it's basically the main ingredient in organic rust killers such as Jenolite, but much cheaper! :D

JustcallmeMrT:
I rigged up an electrolysis unit to clear the rust from my tank, and it worked a treat.  Might not be worth it for a small quantity of rust though, but worth considering.  Google electrolysis petrol tank and you should get a load of hits

mickwinf:
I like the idea of cheap cola Hairygit, as the rust is mainly in the bottom seam it might lead to a leak if the rust was completely removed by the electrolysis method.

Lobo:
Hi Mick,

http://www.sohc.co.uk/index.php/topic,6985.msg39684.html#msg39684

Within this post open up the Internet reference & you'll see a number of 'recommended' ways to remove rust. Don't remember cola being one of them though... Tom400 tried it with apparently little success (see link below)

The electrolysis method will ONLY remove rust, and not good material, which is the beauty of it versus (eg) abrasives or some chemicals. If you're implying that a certain amount of rust is needed to stem any leaks (!) then it can only be a (short) matter of time before you're back to square #1 and doing some sort of other major job on it. How's about a full rust removal, and then lining the tank with eg POR 15, which Tom400 has fully detailed elsewhere here....

http://www.sohc.co.uk/index.php/topic,4758.msg21866.html#msg21866

Yes, POR in tanks is not for some, but perhaps you have little option?

Simon

PS: Electrolysis is cheap too... only 3 tablespoons of the wife's baking soda.. And if I was to do it again I'd rig something better / more surface area than an old crushed can... thinking a steel ruler (raid the kids school bags...)

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