Under normal conditions one separator would be enough for 40 gals. but with dual tanks you might be better off with two to determine if one tank is collecting moisture more than the other. The valve set-up that Tsubaki posted works but I wonder if ya used one separator head and connected both feed lines from the tanks would the engine draw from both tanks simutan,simutin,aw heck,at the same time. Not sure if it will work but it would be nice to keep things balanced.
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