SOHC.co.uk Forums > CB350/400

Fuel Tank Cleaning

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Spenny62:
I'm having a few problems with dirty fuel and think the tank has rusted inside with standing (there's no sign of the tank having perished).  It has had a good clean out with caustic soda and well rinsed after but it seems that there's still rust inside which is getting into the carbs and now clogging up the inline filter I've fitted.

I've already had the tank sprayed so don't really want to buy a replacement. 

What are my alternatives?

Nurse Julie:
If it's a 400/4 tank, its got a big long filter in the tank attached to the petcock. Maybe the caustic soda had destroyed this filter, so any crud would be going straight in to the inline filter you have fitted. Another option is to fill the tank with pea gravel and soapy water, or similar, and shake like hell to help remove more of the rust.

Sprocket:
empty tank. Really very empty.  insert pea gravel as above^^. wrap in duvet. insert package to tumble dryer. 20 mins on the ambient setting (*no heat!) and you're clean.

PatM:
Ive had various tanks with that problem- bits in fuel.

I had a brace of Mobylettes a while back and used CITRIC ACID and sealer.(Moby's have integral frame and tank, so wont fit in a tumble-dryer!!)
My present tank has a sealer applied- which has come away in lumps- looks like bits of gel-coat.
Anyway, ive cleaned out what I can and fitted an inline fuel-filer- its been like that for about 5 years now with no further issues except a leaking inline filter- which i replaced.

kevski:
Caustic is the wrong thing to clean a tank out with, ideally you should pickle it with a solution of 10/15% sulphuric acid and a piece of stainless chain mail, seal it up shake around for a good half an hour,empty and wash through with lots of D.I water, dry quickly and apply some WD40, then make sure you have the internal filter in the tank and preferably an inline filter too.

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