Originally Posted by sunchaser
Nordhavn's 55s, 60s and 63s have interesting fuel delivery systems. After the fuel tanks a transfer manifold with a sump for water collection feeds the 30 gallon of so day tank. All engines recirculate to the day tank. Prior to the day tank no polishing or filtering is done unless the Walbro primary main (4) tanks transfer pump with a Racor 900 is used.
Which in my mind means they will supply clean fuel to the engines (good), while gunk collects in the bunker tanks (bad). The Walbro pumps I am familiar with don't put out enough capacity to be used for polishing the main tanks, but I guess something is better than nothing.