ML 320 2002 (possibly manufactures in 2001) Km 200 000
Issue: fill car with fuel from near empty and know the guage sits on reserve or amber light on occasion on start up the fuel gauge returns to normal for short period then returns to amber light reserve
Possible solution:If my interperation is correct fron the great posts is to pull the fuel pump sensor fuse wait a few seconds?
If the problem persists check the wiring connector under the left rear wheel arch for corrosion?
If wiring is good do a multimeter test like Doc said?
If the above readings are good -- just replace the fuel pump???