Recommendation on fuel pressure regulator for return line on dual carb Options

[Tdskip]

Hi folks end hope everybody’s having a decent Saturday.

I need to button up another project car that was previously (long time ago and original engine long gone) a fuel injection car so it’s got the return line like they all do.

It looks like many of you like to use a pressure regulator in the return line, rather than simply capping it off, and I was wondering if there’s a specific regulator that you would recommend or if a Holley rotary dial to select pressure unit is fine to use.

Thanks!

[technicalninja]

Modern EFI no longer has return lines.

Pretty much everyone has gone to "dead head" with a static pressure regulator in the tank.

Modern stuff is usually not vacuum referenced anymore either.

This was done for evaporative emissions reasons.

Hot return fuel makes for higher gas tank temperatures and more evaporative emissions.

This was SO bad on K-Jetronic that Mercedes had an AC based fuel cooler installed on most of the V8 cars. This only cooled return fuel.

I'd have put that on the feed side...