There was a comment that fuel polishing is expensive. While one can spend $6,000 on a fuel polishing system or more, one can also put in a simple system that polishes fuel very well. When I researched my system I found that many of the packages were elaborate, automatic and could be used underway. These systems could also be used as back-ups for the fuel pump, bypass of the normal fuel filters etc etc. My decision was to put in a simple loop using a Gulf Coast Filter, a couple of Tees, a ball valve, a Walbro 40gmh pump and a toggle switch. When the engine is not running I open the ball valve which lets fuel go to the filter and turn on the pump. All my system does is take fuel from the normal fuel supply hoses, run it through the filter and return it to the normal return hoses. When I pull the filters (roll of paper towels) and drain the water separator I see evidence that the filter is working. Don't remember the exact cost but my guess is around $1,500. Marty Campanella Bay Pelican KK 42