Ok a little background here. Camino has a transplanted 93 LT1 running a 95 ECM it is a M6 setup. I have a Walbro 255 intank pump with a racetronix power harness and relay to give the pump full system voltage. The Camino is running fat all across the entire operating range. I did these pressure checks on the off chance there may be a restriction in the return line causing a backup and high pressure in the supply.

Did a check on fuel pressures and here is how it stands

Supply at idle 44#
Return at idle 3.5#
Vacuum line for pressure regulator pulled 50#
Return line for pressure regulator pulled 3#

Now I remember when I installed a Holley projection sytem in a Firebird anything under 5# on the return was not an issue.
Anyone have anything to the contrary from a manual or something that would say otherwise. There is going to be some return line pressure just because of the length of the return line and all.

Inputs or insights please