Fuel pressure dropping while driving and under acceleration to zero at idle runs 4 lb electric Blue

flathead31coupe said
I will check that fuel pressure as you suggested and see what it is. I was just told today by an old guy that the reason you don't have fuel pressure is cuz it's free flowing. It's flowing around and around and around with the return line. I have a 3/8 supply and a 3/8 return. So when I took the big hump out of the fuel line which was acting like a restrictor now there's nothing to slow the fuel pressure down other than the float bowls but it must be going past that and going right back into the tank

What do the instructions say for the regulator you are using?

Some of these regulators were designed so the return line was the restriction. If you sized the return line bigger than what was called for then you wouldn’t have any fuel pressure.

That’s what you need to figure out.