John's EZ36R H6 818R Build

[STiPWRD]

And yes, using an Aeromotive fuel pressure regulator.

Which one are you using? The Aeromotive 13109 has a return fitting built into the regulator.

[Hobby Racer]

Which one are you using? The Aeromotive 13109 has a return fitting built into the radiator.

I am using Aeromotive 13129, very similiar, just a slightly different pressure range.

[STiPWRD]

I am using Aeromotive 13129, very similiar, just a slightly different pressure range.

That one has a return line as well. Just curious, but why modify the rails when you could use the return line off the FPR?

[Hobby Racer]

That one has a return line as well. Just curious, but why modify the rails when you could use the return line off the FPR?

It is possible to run the regulator in that way but they are most efficient when run on the return side of the fuel system. This way fuel flows through the rail constantly and the pressure is more precisely regulated. That is why they have two inlet ports and one outlet port. Each rail feeds into a separate inlet port and the excess fuel is returned to the tank via the single outlet port.