Electric pump before or after mechanical

Well I've done everything wrong so at least you know someone is backwards. I've never ran a return line number one. Last year's I ran a summit electric fuel pump that was extremely loud with a fuel regulator and brought the pressure down to 5 lb? Is there a return line needed when you can already make all the resistance you want? And now I put one of those little red Edelbrock pumps in the motor compartment! And it's supposed to love to deliver five to seven pounds and I have Edelbrock carburetors I've experience no problem? And still no return lines? Now everybody can jump on here and freak out about it?