Hi i been using these forums for quite a while now and have searched about every combination i can think of for an anwser to this. I bought a 99 GS with the 420A engine about two years ago and lately have been doing some upgrading and modding to it. After a little research I am starting to belive i have a 95 engine dropped in my 99 car. The fuel rail on my engine looks to be the 95 with the fpr on the rail and I also have a fpr back by the filter. The return is blocked off on the rail and i have been looking to see if it hooks up anywhere. After doing some searching i know now the car was originally on the returnless system. My qestion is can i just unpug the vacum on the fpr on the rail and use the one by the filter or is there an issue with running two at the same time?