There was not long ago a SM2000 that was near us in Trellis Bay. I can not remember her name. Her skipper was really a neat guy and showed me little "Amel" things on my boat. What he did as a way of providing clean fuel in an "all of a sudden got dirty fuel situation" was to have another fuel line added to the after tank inspection cover. Just a tube welded in place that is "several" inches from the bottom of the tank. The "new" line is tee'd to the original and has two block valves. This gives him the option of using the original Amel fuel supply, or picking the fuel up away from the bottom of the tank at his option.