Walbro fuel pump install

Just installed a Walbro fuel pump in my car. I can’t remember if the the tube that runs the length of the bracket was capped or not. There was orange cap on it I believe, can someone confirm. Is it a return line? Should it be capped?

im sure you have this figured out by now but for future people looking on this thread…

that line is a return yes. also, the pump needs to be isolated from the hanger. that rubber grommet it came with or the sleeve. the pump isn’t supposed to be metal on metal with the hanger.