TLR_a4

I searched through forums and found that a bad fuel pump might be the culprit. I just hope it's not anything related to the rear differential. The noise just started about a week ago. My camera was placed underneath the gas tank on the right side(more or less underneath the passenger rear seat). You can barely hear the ticking noise on the left rear side. Wasn't quite sure but I figure it's time to replace it along with the fuel filter.
What do you guys think?

'97QM 154k<ul><li><a href="http://www.youtube.com/watch?v=Rt7L3kG5JhQ">Video Clip</a></li></ul>