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Discussion Starter #1
Hey guys,
my bike,s been in storage for a couple of years.
ive been starting it every week but the other week it wouldnt start and i noticed rust spots in the tank so i pulled of the tank and found the fuel filter was full of rust.
ive been loading it up with WD40 and nuts and bolts shakeing the crap out of it
any other idea,s
 

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Loading what up with wd40?

Describe better the condition of the tank, but more than likely you will need a new one.

Flush fuel lines of rust and carb clean unblock jets at he least.
 

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out of curiousity.. if the bike was in working order and you started it every week, why has it been sitting in storage for a couple of years?
 

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Are you saying that you put nuts and bolts in the gas tank and then shook it? Also, WD-40 is not the solution to removing rust from the inside of your gas tank. If your fuel filter has a significant amount of rust scale built up on it then there must be a source within the tank that is releasing this rust. You need to locate the source, You may have to illuminate the inside of the tank with a pen light or small flashlight and possibly some small dental mirror. Places to look initially will be the areas where the tank has welded or pressed seams or anywhere metal is joined together, the biggest problem will be trying to see inside the tank. One other suggestion, find a child or a girlfriend with a small hand and see if they can reach inside to locate the area where the problem exists, yes, this can actually work for you. If the rusting is extensive and near the bottom of the tank, there is a good chance it may make its way through to the outside. When storing a bike with a steel gas tank, always fill the tank completely during storage so as to not leave any exposed metal within the tank. If you do decide to have the tank coated on the inside, be sure to have it done by someone who will guarantee the work for you. This is a small insurance price to pay if you are going to the expense of having the tank re-painted, as I have seen other tanks re-painted only to rust through, by means of a tiny pinhole, shortly thereafter. Please tell me you didn't put nuts and bolts in the tank, anyway, hope this helps
 

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I took my tank to a shop that specializes in gas / compressor tank repairs. They did a really professional job and my tank has stood up very well in the intervening years. I would take it your tank somewhere.
 

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small linked galvanized chain throw in some petrol and a cement mixture, or any other way to spin it for awhile. tie a a strong piece of string to one end of the chain so u can get it out. flush it out after with petrol and buy some tank sealer
 

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Im a DIY expert.

The yellow GPZ tank is an upsidedown horseshoe, which carries I think about 13 or 19 litres. I forget which.

It had been sitting in a shed sometime before the Big Bang and was badly rusted. After doing a lot of research I will give you the options I tried and their results.

Options:
Hydrochloric acid (sometimes called myriatic acid on American sites)
Weaken the acid in water and slosh around. Leave for 20 minutes to a few hours, depending on the strength of the solution.
Rinse out quickly and completely. Either spray with WD40 or use a baking soda and water mixture to neutralise any remaining acid.
Hit with an air compressor to dry.
As soon as remotely possible, get fuel back in there and get going.

Result: HCL is insane on metal at full strength. But if you dont clean it off - and we're talking REALLY clean it off, it keeps on working :D Holes occur - not cool.

A less metal hungry solution is phosphoric acid and that takes longer, but works in a more gentle fashion.

FORGET KERO AND THE NUTS AND BOLTS OR CHAIN OR SAND OR ANY OF THOSE THINGS. The only reason Im saying it is because you dont want to be shaking shaking shaking for 40 minutes and the trying to get all that crap out of there. Its labour intensive and hit and miss in my experience.

My latest idea has been to use anodizing. If you google up anodising rust from a fuel tank, you'll see many articles. Essentially, buy a threaded rod from bunnings, fill up your tank with water and baking soda, connect up a small charger and put the rod in the water. Once you hit the power, the rust is attracted off the tank onto your rod. The rod becomes rusty, the tank becomes clean. No acid and no further silliness.

The only problem with it on the Z is that due to the shape of the tank, its hard to get a rod down there (even a bent one) without touching the sides of the tank, which ruins the reaction. Another downfall is there is a black residue on some parts of the tank afterward. These can be easily removied with a hose or whatever.

And what option did I take? I bought a secondhand GPZ and stole the fuel tank (and other bits) off that. Rust in your fuel tank is not fun. At all.

It may be different for the CBR250 (I cant remember the sinde of mine), but on weird shaped tanks, either leave it to the pros or get yourself another.
 

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Also, the tank treatement kits can degrade over a few years leaving you with white chunks in your tank. Im sure your bike isnt that bad, but going on the availability of these parts, possibly get a new one.
 

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because of the shape, tanks are the worse things to try shake something out of......
you can be there for hours tryna shake that last bit of gunk/petrol out of there......trust me.

ive used a vacuum which made things much easier.......still takes a bit of time though....
you might want to do it when the tank is dry however......
 

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dunno about removing WD 40 from tank, but I do lot of tanks, all successfully, the reason people fail is the cleaning solutions need to do their thing, then be fully removed, which can't happen if there's scale,
step one, shake a large number of metal pieces around in tank, chain won't get into corners, I use short pieces of flat bar, then various washes including phosphoric acid rust converter, then seal it, and not with that kreme crap because it doesn't really stick
if tank doesn't need welding, I charge 75
 

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Discussion Starter #12
well i didnt realy want to muck around with acids myself but it sounds like the go.
the rust seems to be at the top of the tank caused by condensation.
because the bikes been siting for a while not full of fuel.
the tank doesnt need welding.
if you can clean and seal it for $75 simon
im probly better off giving it to you to do.
where abouts are you located.
thanks
pete
 

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To remove the rust l would use E-rust 2013 leave in tank until the rust is removed.Then use a sealer This E-Rust 2013 can be reused, It is made by rustrid australia. They also have a rust blocker. Check the website www.rustridaustralia.com.au This might help
 
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