I’ve done this mod, can’t say I monitored fuel pressure though sorry.
Radium also make a part that can be fitted in place at a different point I believe though.

From what I understand of the mod though, with high flow pumps that return more fuel that was not needed, it lets the return side flow better and has the added effect of pulling over more fuel from the other side of the tank.

If no fuel is being returned at all however this system won’t work at all.

I don’t believe fuel pressure should be affected, unless there was either a blockage or, a lot of fuel that needed to be returned to tank and caused a back up due to flow limitations .


Sent from my iPhone using Tapatalk