I'm in the process of working through some improvements on the family motorboat and today tackled the fuel system.
The fuel filter/separator (Separ) has been gradually filling up with black sediment. I've tracked this back to the dip-pipe in the main tank which is encrusted both internally and externally with a soft black residue. I really don't think this is bug as the rest of the tank is pretty clean considering its age and we regularly use Soltron or Grotomar. It seems to be a reaction with the copper pipe which over the years has eaten into the copper. Does anyone know what it is?
And before you ask, the plastic spoon you see in one of the photos was what I used to decant all 290 litres
. I've no idea where the marble came from!