Yes, as the fuel polishing system is setup to filter the fuel from either tank, we are able to setup the system to return the fuel to either tank.
Does this mean that you can fill both tanks up by using the one filler?
Technically yes, however the flow rate of the bowser is far far higher then the flow rate of the fuel polishing pump (80 GPH) and therefore you would be at the dock for a very long time...
The abilitity to transfer from tank to tank is useful if you have been using one motor more than the other and want to balance out your fuel.

The below image is an installation from a Seawind 1600, however this is the same model as offered on the Seawind 1370
Note, on both the Seawind 1370 & 1600, the fuel polishing system has dedicated fuel tank pickups and is not an in-line system.
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