I'd think if the filter was that plugged up, the car wouldn't run.

You say the other pump was making noise too, you put it on another car, and no noise, right?

I can't remember how my 202's fuel pump is held on - have you tried running the pump with it not connected to its mounts? If you open the gas cap, does the noise go away?

I have no clue what's going on here, but I suspect the pump is fine and there's something with the car. A fuel filter is only 20 bucks or so. Change it and see what happens. Probably hasn't been changed in a while anyway.

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