Pobably not the fuel pump. Something else in the vicinity must be making the noise.

Lotsa stuff in that area - CV joints, brakes, rear end, etc.

__________________
Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport