Anyway heres the good bit it seems that this is quite a problem on boats and guess what there is a cure.
It is an enzyme treatment which effectively turns the sludge backinto usable fuel.
It reduces emitions and increases performance and 10ml will treat 11 gallons of fuel. ( approx 1 BX tank full )
The bacteria that cause the sludge cannot grow in water or fuel but thrive and grow on the interface between the two.
The product is called SOLTRON and information is on their website at
WWW.SOLTRON.CO.UK
From the chat i had this morning at our local marine engineers it sounds like a miracle cure.
Regards Kermit