FWIW, our boat was built by a sister company to Mainship... and there is no cross-over on ours. Port engine runs on the port tank, starboard on starboard, period. Possibly (just guessing) because it simplifies the return path from each engine to each tank.
We do have a selection valve for the genset, so we can choose to run that on either tank...
Not sure if any of that will apply to yours, but there were often common engineering concepts and common systems in the related brands.
-Chris
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Chesapeake Bay, USA
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