CB1100RS fuel tank rust

[pekingduck]

That is a negligible, harmless amount of normal corrosion.  In a hot climate, it may be better to keep the tank fuller rather than emptier because condensation in the air within the tank makes it more rust prone.  The tank was manufactured and a rust coating/treatment was applied, and using wire brushes or rough pads can remove it.

If the rust was really bad, the tank can be emptied and removed, and the fuel pump taken out to allow a pretty large opening, and you can easily put your hand inside.  There is a large, replaceable, though pricey, mesh filter attached to the fuel pump, that likely can be cleaned or blown clear, so actual harm from rust is quite unlikely.

Hi Pekingduck. Can the $380.00+ fuel filter  be cleaned, and reused?

Thanks.

It's a nylon mesh bag, easy to rinse out.  They're like many other Honda and likely other Japanese brands.  And yeah, vastly overpriced. You can find replacements on Amazon, $100 with the pump.
   

[TheLegend]

Hi everyone,

I recently bought a very well kept CB1100RS, but I noticed something unusual. There’s quite a lot of rust inside the fuel tank, especially around the top section and near what I believe is the breather hole/vent.

What I find strange is that the bike is absolutely pristine on the outside, yet the rust is concentrated only in this specific area.

My questions are:
How serious is this issue?
Is it something that can be repaired, or should I be thinking about replacing the tank altogether?

I’d really appreciate any advice or experiences you can share. Thanks in advance!

Use Hammerite Kurust, I use it with succes on any kind of rust, for over ~ 30 yrs
https://www.amazon.com/Hammerite-5092820...4UMUA?th=1
PS: I wonder why in all adverts, Honda says that at RS/EX the tank is all aluminium?

[tdbru]

Here's a tip I learned with a carb'd bike and ethanol gas.  Ethanol is hydroscopic, meaning it absorbs water.  causes rust.  also the alcohol evaporates and the result is kind of gummy and plugs up the tiny orfices in carbs.  

add 1/2 oz (15ml) of TCW3 two stroke oil into the gas.  it's ashless, made to burn off with fuel in a chainsaw, weed wacker, outboard, etc.  Just that tiny amount of oil in the gas will keep the tank from rusting with the ethanol gas we have to run.  Walymart has a gallon of that stuff for a pretty cheap price and that will last many many fillups/miles.  256 fillups to be exact.  I found some 2 oz HPDE plastic chemical bottles.  Can't remember where from.  I'd search for a chemistry products place.  similar to https://www.berlinpackaging.com/312189-2...81c6c8ad58  One bottle works for 4 fillups on a trip and takes little space.  Probably on a trip you don't need it too much as you're running gas through the bike regularly.  But when the bike is sitting between trips I think is when you see the biggest benefit.