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Rust in Tank

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boilermaker1:
Hi all
I have some very mild patches of rust on the inside of  my petrol tank.
What is the best cure for this ?
Thanks in advance

sgd37:
I treated my badly rusted tank with phosphoric acid. About 45% concentration swish around until there is no more rust (about 5-10 min), empty, wash out remaining acid with coca cola (yes I'm serious, it's the only way I found to stop it from flash rusting), then put in methelated  spirits (300ml) to absorb all moisture, finally wash out with petrol. It should leave a rust resistant iron phosphate layer. Mine has had this treatment and has remained rust free since. Also be careful that the acid will attack the petcock so don't leave it in too long or take it off completely.

If you can reach the rust then coke and rub with tin foil works well due to the phosphoric acid in the coke.

Clunker:
That sounds like good advice sgd37 but I'm wondering does the acid damage paint?

sgd37:
I had a few spillages while doing mine and the paint didn't look affected at all. Obviously I didn't leave it on there but washed it off with water with some bicarbonate soda mixed in. Phosphoric acid is pretty safe as long as you take sensible precautions. It is only stuff with magnesium in it that is at risk.

philgresty:
Fill it full of vinegar and leave for atleast a few days

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