258 fuel pressure

Dis is a 258?

Mechanical pump?

Are you able to see the fuel pressure to each carb while it's running?

The Medic

Showing 4.5 under load at the regulator. Electric pump. Thinking that since it is a dual carb setup..the 4.5 may lag behind given the draw...does that make sense? Meaning should I bump up to 6 at the regulator since it splits off to two fuel lines?

I was a plumber a few years back. Volume and Pressure are two different animals, people tend to wanna increase their water pressure in an attempt to overcome galvanized piping being nearly internally closed off due to being almost rusted shut, or to overcome their improperly sized piping (copper/ pex/ pvc).

Do you still have a return line outta your fuel filter?

This would be my 1st test/ attempted fix

A separate regulator for each carb might give you more volume, just jacking up the pressure on just one regulator (feeding 2 carbs), may not make up for decreased volume trying to push thru the regulator's internals.

I bet the mechanical pump woulda provided enough fuel! But I'm guessing!

If you are experimenting, maybe increase the fuel line size from the pump on.

I have a Holley 390 on mine (pic above)

Your turn

The Medic