Rust out of the Gas Tank

[Gregg]

Anyone have any suggestions on how to remove light rust from the inside of the gas tank. Tried CLR but it had little effect. Thanks Gregg

[Hahnda]

I like to flush out tanks with something called Milkstone Remover and a handful on misc nuts and bolts. The Mikstone Remover comes from the local farm store and is actually Phosphoric Acid. I dilute it about 50/50 with water and let it sit a couple of days or more if needed and give it a shake every once in a while when I walk by. Drain it out along with all the hardware I stuck in there. The phosphoric acid leaves a nice coating that deters flash rust.

[e3steve]

The more I read on this forum, the more I learn (well, that IS the idea, I guess!), so I'll try to impart some knowledge from the marine world myself: ferrous rust can be de-oxidised with Ferronet - at least, that's what it's called here in Europe - from chandleries or on the 'Net http://www.mercamania.es/a/listado_prod ... ductos.htm
or
http://www.nautilus21.com/catalog/produ ... cts_id=448
where you'll need to understand a bit of written Spanish.

See screenshot attached; the gist of it is:

Liquid rust-remover Ferronet is professional quality and excellent yield (effect). Oxide eliminator: apply to the oxidized area. Leave it to activate for 5-10 minutes and wash away with water. (For railings, doorways, pieces, household-electrical ['white' goods] and all types of oxidized surfaces). Use brush, sponge, etc.. Calcium (limescale) decrustant: reduce to half, or up to 4 times, with water and apply. (Inside pipes, faucets, stainless sinks, etc.) Wash away afterwards with water.

This stuff is good and simple to slosh around inside a tank. And I like the idea of a handful of nuts & bolts inside for abrasion/agitation - use stainless ones, also from chandleries (and cheap), as they can be reused without detriment.

Steve