Just wondering has anybody ever used phosphoric acid to treat rust in your fuel tanks?
If so what was it like and what did you do to seal the tank off afterwards?
I have heard of some of the products like POR-15 but I am unsure if I need to go that way as my tank isn't really bad it just has a little rust on the inside that I want to stop getting any worse or into my filter.

Cheers
Luke

try using just the por 15 cleaner and sealer do it once do it right

If you do use phosphoric acid, I dunno how long your fuel tank has been sitting for, but if its only been a little, make sure to wash it out thoroughly and consult a chemical risk analysis report via google for phosphoric acid, there might even be a phone number on the back of the package for info, just like medication has... if you come across the report, they list what not to mix it with and what it could do. might no be dangerous at all ,but i can't forget that guy that ended up permanently crippled after gas mig or tig welding near some brake components taht had a little bit of brake cleaner still on them, ended up making a nerve gas agent that left him pretty well hurt. Hate to see anyone go the same way....

Thanks everyone for your replies. Sounds like POR-15 is good but I believe Phosphoric acid would clean it up ok and wouldn't react to the petrol but I will have to do some more reading.
Has anybody ever tried electroplating a fuel tank? I am aware that you can use electrolysis as a good rust remover in a fuel tank but can you electroplate one? and if so what would you use as your electrode?(copper,nickel?)

Thanks for your help,

Luke

B 4 u use any product

pull the tank out an strip outlet pipe etc etc

give it a good wire brush or even a paint strip on the under side

get 50 or so nut n bolts any type will do even a length of chain fill wil a few liters of soapy way put nut n bolts inside tank with water n soap and shake the hell out of it to remove any crud or possible rust

Wash it out with heaps of water and hold up to the light and check for Pin holes

NO product POR15 or what ever will fix rust or pin holes its has to be cut and welded fresh metal into place

Lee

theres no substuitute for solid metal

Try hydrochloric acid that you stick in the swimming pool. Add water to the tank and then pour the acid in till you can hear it fizzing. The fizz means it's eating the rust. 5-10 mins should be fine but depends how bad the rust is.

Do this outside and hold your breath when you go anywhere near it. Give off fumes that will make you unwell.