Auto Racing: fuel tank and lines, gallon fuel cell, holley 750

Question
I am just getting into drag racing and have some questions about a car I am building.

I am installing a Harwood 5 gallon fuel cell in the trunk.  It has two outlet lines.  Is one for the fuel out and one for the return?  I would like to know how to install and set up all the fuel lines.  
Questions:
Do I HAVE to have a return line?
If yes, how and where is the reutrn line in the whole system?
Is this how the system should be set up....tank to filter...to electric pump...to regulator...to carb?  Where does the return line go then?  

And what should I set up the regulator PSI at?  The motor is not THAT strong.  I'm guessing it will run mid to low 12's when I hit the track.    My fuel pump is a Mallory 140gph.  The carb is a Holley 750.  I could use some good specific advice on how to set up this entire fuel system.

Thanks,

Price Allen
San Antonio, TX  

Answer
Hi Price:
I Think I goofed and your answer didn't get sent the first time.

The cell you have with dual outlets is made so you can run two fuel pumps on seperate pickups for more reliability. You can plug one of them if you like.

Your fuel components should be in the following order 1) fuel cell, 2) fuel filter, 3) fuel pump, 4) pressure regulator, and 5) carburetor.  On an off road vehicle with a carburetor, there is no need to run a return line unless your racing rules require it. You should have an air vent from the cell to the outside rear of the car, and it should be mounted as high as you can get it. Also put an overhand loop in the hose to prevent fuel from sloshing out during launch.  The next guy in line will appreciate it !

All your fuel lines should be of the braided stainless hose like Aeroquip and other manufacturers sell. I get mine from "www.summitracing.com",  use the aluminum reusable fittings too.  These hose assemblies are nearly bullet proof. Yes, it's expensive, what around racing isn't ?

Finally I THINK your fuel pressure should be about 5-7 PSI at the carb, but ask somebody else, my experience is entirely with smaller sports car engines. I'm not real familiar with the Holly 750.

Good luck with your project, I hope I've been some help

Sincerely
Dan Liddy
Sarasota, Florida