I'm not a fan of deadheaded fuel systems. I have seen several issues. Hard to get the vacuum line to the regulator, if air gets into the line it causes a pulse and doesn't clear for a while, Fuel sitting in the line is subject to heat soak at low engine rpms which is the worst on a hot day sitting at a light.
Also, the best fuel pump PWM systems respond to fuel demand not just TPS position.
I agree with all of this.
The downsides of the limited “extra” plumbing are not worth the small benefit of a shorter return line.
My post was hinting at the fact that if you are using a non referenced return system, go all out and use the pwm set up. This still doesn’t negate the very real other problems stated.
