The main tanks all have fwd and aft outlets on all of the 337's. Both feed a small header tank in the lower boom, aft of the lift strut attach point. That is where the sump drain valve is located.
The aux tanks have a 18 gal capacity, not 20 gal, and all is usable.
If you are having problems with fuel feed, check your vents to assure that they are free and clear.
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