Petrol tank crud

I will flush it again before putting in the etching liquid

As you mention etching, are you intending to install a liner? Is so, please research previous owners experience with coatings breaking down.
 
Just as a heads-up, where the pencil filter has an early advantage is trying to stop debris from entering the shut-off valve. When the debris enters the valve, it generally scores the brass which causes them to leak.
 
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