Say 'NO' to Walboro....they're rubbish! Genuine 044 for the win and reliability.
-8 for tank to surge to pump to engine, -6 for engine to surge tank(return), -4 for surge vapor to tank and tank vapor
This way the carter(good choice) will actually keep positive pressure on your 044. Fill the surge from the top,with the return higher and the vapor higher if possible and feed the 044 from the bottom of the surge, even though the returned fuel will be a few degrees higher the flooding action of the carter will pretty much make it a non event......