Which fuel rail should I use

[phoenix1987]

I have the corvette return system and the returnless system. Which one should I use in my 87 Trans Am?

[Breadfan]

That may depend on the amount of power and fuel requirements, as well as if the system you plan to use is designed for either/or.

If EFI, the computer may expect one or the other and need calibration.

If you need very high fuel requirements you're generally better off with a return system. If you don't need it, it saves you extra line plumbing.

[phoenix1987]

But can't I just use the return in the fuel pressure regualtor? How do I use the fuel press. regulator return line with the fuel rail return line?