simon k wrote:
it's wax and residue from the petrol... if there was rust in there you'd find bits of that too
I let mine dry, then held it upside down beat on the outside of it to loosen all of the stuck on crap, shook as much as I could out and then rinsed it out. Inspect for flakes of rust in the stuff you shake out
Make sure you have a big fuel filter on it when you put it back in the car
Update:
It worked , after a lot of flushing and reflushing and then banging rinsing with petrol over and over again , no black floaty bits anymore.
Also interestingly flushing the tank out with pertol into a clear container you could see the water gather into a bubble into the bottom of the container " looked quite cool with the sun shining through it ".
So thanks again simon and for the rest of the replies ," in for some spinal injections tomorrow " woohoo " so i will put the tank back in on the weekend and try fire pickles up again " oh installed one of those clear fuel filters too.

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