Spoiler and Fuel Pump

I am wanting to put a spoiler on my daughters 528e. I think the spoiler on the 6 series will fit am I right or wrong. Does anyone have a suggestion of what will fit? My other question is should I be able to feel or hear the transfer fuel pump run when I apply 12v to it on my test bench. The fuel pump mounted on the frame will spin when I apply power to it on the bench so I think it is ok. Could it be a relay going bad that keeps the tranfer pump from working? Any help getting my daughters car running will be appreciated.