Posted by bc on June 17, 2009 at 15:53:51 from (69.148.27.75):
In Reply to: Rust in gas tank posted by timberwolves on June 17, 2009 at 12:42:49:
Not sure about the boiling, but when you acidize a tank to get rid of the rust, the newly clean bare metal will flash rust. There are plenty of posts here in the archives about rusty tanks. If the tank is acidized with phosphoric acid then it doesn't flash rust so bad.(sold at home cheapo in a grey container in the paint department, I forget the name)(they also have another brand but which may be cheaper but not sure of the concentration)
Even then after being acidized, the bare metal needs to be sprayed with wd-40 or some other type of (W)ater (D)ispersant of another brand. Then it can still rust again over time.
I'd take it back and see what they boiled it in and ask why they didn't treat it any further. I forget what chemical they use for boiling radiators but I believe it is a water base.
I just did the gas tank on my tiller using the phosphoric acid with water mix. Then sprayed it down with wd. I'm not sure the mix I used was very strong as I think the label said mix it 10 to 1 with water and there was still a little rust on the sides. I did my tractor tank with 2 gallons of muratic acid sitting in the bottom for a half day where most of the rust was and then filled it the rest of the way up with water for another day or two. It was shiny inside. Then sprayed it with wd. I still get some rust in my sediment bulb.
Best thing you can do is put a 1 inch or so rubber hose extension on your sediment bulb to keep the bottom dwelling rust from getting into you sediment bulb or make a screen from some brass or steel window screen or buy a screen to fit on your sediment bowl where it sticks up into the tank. I used a couple wraps of window screen the first time and held it with a piece of twisted wire around the little nubbing on the sediment bowl and stuck it into the tank. Only thing I see in the bowl now is some occasional rusty fines.
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