- Sep 25, 2004
- Reaction score
- Your Mercedes
- 1996 SL 500 , 2003 CL55K, 2004 E320CDI
on my sl55 2003. when the engine is running there is a constant humm from behind the rear self. the hum is constabt irrespective of engine revs, but does diminish when the car the bending to the left and right.... is the ok? could it be a fuel pump?