Will Barber
Senior Member
- Joined
- Jan 25, 2010
- Messages
- 234
- Reaction score
- 60
- Location
- Cheshire
- Your Mercedes
- 2012 CL500 (4.7L M278)
Hi all.
On route to an event this morning I "opened the taps" on my 2011 CL500 and immediately started to hear a whining noise. At first I thought it was the turbos but then thought it's never done that before so why should they now?
It was only briefly that I held it at full chat (10 seconds or so) and after coming off the throttle the noise disappeared after a few seconds. However on the way home, again after giving it some work to do, the noise returned but got much louder and seemed to turn into a groaning noise, coming and going for the next 30 miles or so.
Performance isn't effected, and it seems to be coming from the mid LH underside of the car.
My first thoughts are could it be the fuel pump (if it is indded underfloor mounted), or is the pump in the fuel tank on this 2012 model year car?
The car has done 67k miles and has full dealer service history.
There are no logged faults either.
Any guidance would be much appreciated.
Thanks, Will
On route to an event this morning I "opened the taps" on my 2011 CL500 and immediately started to hear a whining noise. At first I thought it was the turbos but then thought it's never done that before so why should they now?
It was only briefly that I held it at full chat (10 seconds or so) and after coming off the throttle the noise disappeared after a few seconds. However on the way home, again after giving it some work to do, the noise returned but got much louder and seemed to turn into a groaning noise, coming and going for the next 30 miles or so.
Performance isn't effected, and it seems to be coming from the mid LH underside of the car.
My first thoughts are could it be the fuel pump (if it is indded underfloor mounted), or is the pump in the fuel tank on this 2012 model year car?
The car has done 67k miles and has full dealer service history.
There are no logged faults either.
Any guidance would be much appreciated.
Thanks, Will