Put a euro R in my 93 prelude somehow I didn't label where the lines when on my fuel pressure regulator. I know the top one is a vac line but the bottom one should be a return.. I thought.. But I have no line for it,Can someone please tell me how to hook this thing up.

 

Stock fpr or aftermarket? Is the fpr bolted to the rail? If so there is a small vac line and the bigger return on the bottom.