Hi! I recently purchased a 99' C280 that I absolutely enjoy driving.
Nonetheless, I have encountered an annoying noise that I can't seem to
identify. It is a loud thumping sound that is occasionally coming from
the rear right quadrant of the car. The sound is audible when the car
is at a standstill, whether in "Park" or in "Drive". I took it to the
dealership and they said that it was just normal operation of the fuel
pump. I really don't think that a loud, random, thumping sound is
indicative of any fuel pumps "normal operation". Can you provide any
additional insight?

Sorry, I haven't seen this problem yet. Let us know if they figure it out!!

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM