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IMHO & in theory your return to the tank purge line is being pressurized with a mix of fule oil and …air coming from the downstroke of the cylinders used to push out the crankcase residues.
that said if you ran 30 min. on the lake and the cap was closed you have your answer …
the fuel sucked out of the tank de- pressurises the tank (cap closed) and the return line is pressurising it back up and more since the air volume pushed out from from the crankcase cavities is much larger in volume, compared the fuel pumped out out of the tank.
jmho if it works don’T fix it 🙂
btw you should have your excellent work & pictures published in the Outboarder so anyone wishing to save the environment can go ahead in confidence and recycle all that polluting oil/fuel currently
being flushed into the water.
your engine is getting close to ETEC standards ! 🙂 Surely better than a 4 cyl with all their crankcase oil not being recycled properly beind the barn. 🙁
Joining AOMCI has priviledges 🙂