Quote Originally Posted by Tonka View Post
Ill try and add some photos, currently I see thicker line that is the fuel into mech pump, another fuel line that is hooked to back to tank of the mech pump between two brake lines, and then that vapor line in the back, closest to the firewall.
Of the three fuel lines attached to the inside of the driver's side frame rail, the middle one is the return line. From your description, it looks like you attached the return line to the fuel pump. If so, that's what you want since it's closest to the original fuel line routing. You can either cap the regulator's return port or get a "T" and join it to the original return line. Get a fuel pressure gauge and measure the regulator's output pressures. If both ports measure the same, I think you can cap the return port. If the return port is greater, join it to the original return line. Then test drive it to make sure fuel pressure and flow are sufficient for the Weber.