In _From the fryer to the fuel tank_ the author recommends a system that he claims eliminates the need for return lines by looping the return line from the IP.

What are people's feelings about this? Most of the other systems I've seen here and elsewhere use either a 6 port solenoid or a second 3port solenoid to return diesel and WVO to their respective tanks.

What are the advantages/disadvantages of either system?