A common problem I have been experiencing with my 2000 ML430 is the gas gauge works properly when I am about 2-3 gallons shy of a full tank. If I top off, the gauge faulters and the sending unit needs to be reset by disconnecting the plug at the rear left wheel. I remember reading a post regarding the alignment of an arrow on the sending unit to adjust the level displayed on the gas gauge. I am wondering if I could realign the sending unit, thus the signal to the gauge and fix this annoyance. If not, what part of the sending unit is it that reads the levels? I had my virtual calculation in the sending unit converted to read just the fluid level in an attempt to remedy the problem. I really don't want to replace the sending unit again, so any suggestions are appreciated.

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Steve32

You can check the resistance of the sending unit....

Attached Files

W163 FUEL GUAGE.pdf (61.7 KB, 133 views)

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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

A dealer can check the coding like this....

Attached Files

W163 CLUSTER.pdf (53.9 KB, 174 views)

__________________
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