I just picked up this 20gal alum. fuel cell from Laketex and I am wondering what lines go where. It has two ports on top and two on the bottom sump. I know I need a return line and a feed line. How do I tell which is which? Anyone ever do this? Oh and how close to the tank do I run the external fuel pump? Is it possible to use the in tank fuel pump fromt the donor. The cell has foam in it now does that make a difference? Thanks in advance.