[sacarguy]

ahh but thats a tricky situation ther IS a regulator in the PWM system

its the closed loop between the ecu and the preasure sensor that tells the ecu to lower or increase pulse width

so in reality it still is a regulated system its just regulated by change of pump speed instead of bypassing the extra fuel.

pwm systems work well and can be reliable when setup right i personaly have the stock pwm returnless system in my 06 mustang and have made over 850 rear wheel horsepower with it via custom tuning and a larger heavier duty pwm pump driver module and replacing the single factory pump with dual pumps wich flow 310 litters per hour each.

I will be adding a third pump and another pump driver module now to supply enough fuel for a nitrous kit as well.