One thing to remember with OE "dead head" systems, there is still a fuel pressure regulator at play, it's just inside the fuel tank which helps drive the fuel syphon circuit to pickup fuel at the bottom of the tank.
With my fuel system in my car, it's "dead head" with 1 line going to the front of the car from the regulator and the return going through the ethanol sensor back into the tank. I just mounted the fuel regulator down the back next to the fuel cell. I set the regulator at 65psi but I use a PWM module to slow the primary pump down to 45psi and raise the pressure with RPM. The regulator is just a fail-safe if the PWM module fails and locks on.
Mine is also a dual pump setup, the second pump switches on when pressure goes under 50psi when over 3500rpm, mainly for e85 use.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120
'66 Pontiac GTO - 389, 4 speed street cruiser
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