I think Brian Smyth hit the nail on the head: build a high speed fuel filter system (aka "fuel polishing") and then send some of that to a small day tank for immediate use, with the balance back to the larger tanks. From the day tank to the engine is a small, simple, final filter system. No duplication of plumbing or filters or pumps. Day tank fuel as almost no time to go bad. What always bothered me about Steve D's system was the complete duplication required: one complete fuel filter system to the engine and one complete fuel polishing system. Of course, Steve was talking in terms of retrofits to existing systems and it makes no sense to rip out a functioning fuel filter system to the engine; Brian is starting from scratch. Brian's system seems to be a step ahead: performs all the functions of dual systems for less initial cost and (I think) less maintenance, is suitable for all hulls, regardless of length of journey or age of crew. What else could we discuss that gets it all done for less? Regards, Bob Frenier