So what was done with the vacuum port off the stock fuel rail on the return style? Does that reference the fuel pressure? I am doing the intake swap from the 03 intake to the TBSS intake

 

it just gets capped/rmoved.
I dont remember...let me look at the pic or pop my hood.

 

if you don't use a vacuum referenced regulator you just need to configure your injector flow tables for a returnless setup.

 

get the proper rails at a salvage. then it will have a fpr on the drivers side rail . you will have to tap the intake for the vacuum line off the fpr. I had to do just to opposite to my 03 LQ4 on my 04 returnless truck

 

afaik they don't have a stock return style for the l92 or ls2 truck(tbss) intake.