Originally Posted by MyLuna
Additional follow up.
I left the filler cap loose overnight on port tank and as I expected fuel flowed from full starboard tank to port. Anyone have any thought as to why mainship would not have vented the tank that gets fuel return?
I am in the market for a Pilot 30 II and have been studying the systems for a couple of months. According to the owner's manual for the 2003 model year, there are fillers and vents on both port and starboard tanks. Interestingly, the main engine fuel supply and return are plumbed to the port tank only. It seems to be the 'master' tank in the system with a crossover hose and valves to equalize the levels in the tanks. I suspect the port tank also contains the fuel level sensor.
This appears to be the way Mainship designed them, and it seems to work for most.
I would personally prefer a proper 6-way fuel selector valve
to control the supply and return, but that's just me.