I have read other forums and I know that the fuel sending unit is often faulty in these cars. I also noticed that the sending unit reside as part of the fuel pump ......which from what I understand has electrical issues.
My fuel guage stopped working the other day, but the fuel pump seems to be fine. My other guages on the cluster seem to be working fine with exception of the fuel guage so I dont think it is a fuse issue.
Has anyone had a similar problem? I am not sure if this is a guage problem or a sending unit problem..

Can the guage be 'Reset'?

__________________
1999 ML430
2001 Land Rover Discovery II
2001 Lexus IS300
1996 Convertible Cobra
1965 Olds 442 - Weiand 8-71

Measuring the resistance of the sending unit would be the starting point for ME.

At the connector for the fuel pump behind the LR tire measure the resistance.
With a Full tank the reading should be about 1 OHM & empty about 200. Reserve reading about 150 OHM.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thanks it seems I have the same problem with our ML.

98 ML320
97 C320
95 318ti
92 190E 2.6 Sportline
82 300D Turbo Dsl

I looked all around the LR tire; maybe I'm blind, but I didn't see the connector. Do you have to remove the plastic wheel liner to access it?

__________________
2008 ML350
2007 Honda Element
2007 Honda Accord
2009 Honda Civic

I was looking at the rear of the tire; it's toward the front, just below the fuel filter (which is mounted on top of the frame rail).

Attached Thumbnails

         

__________________
2008 ML350
2007 Honda Element
2007 Honda Accord
2009 Honda Civic