I have a 2001 mercedes c180 coupe petrol 2 litre. Non start.

SOURCE: Porsche 944 S2 inaccurate petrol gauge reading and oil level warning light

This is not a known solution, but in general these cars suffer from voltage and current drops on electrical connections due to corrosion on contact surfaces. I cannot remember the number of times I have read about electrical problems on these cars, and the problem was usually solved by cleaning the electrical contacts or replacing a relay going bad (BTW, this car does use a lot of relays however I doubt there is one in the fuel gauge circuit).

Also, I have a spare gauge cluster for the 944 and when I look at it, there are some resistors on the "printed circuit" piece. If one of those were to lose tolerance, or burn open, it would no doubt have an effect on the accuracy of the circuit. I would check out that circuitry and test the resistor values as a last resort -- it is not likely the gauge itself if it is working at all. However, before doing that I would clean the electrical contacts thoroughly. I have not tried to gain access to the wiring harnesses for the gauge cluster while it is in the car, but I doubt it is possible. So, if you have exhausted all other ideas go to the Clark's Garage site for instructions on how to remove the dash, and just follow the portion that applies to removing the gauge cluster. Go to the local electronics hobbyist store, or online, and obtain a good contact cleaner and clean all of the electrical contacts while also looking for loose or broken wires. NOTE: Be careful and gentle dealing with the plastic connectors on these cars as they tend to be brittle and little tabs break off easily if man-handled. Go slow, be in the right frame of mind and use good lighting so that you can see what you are doing.

SOURCE: poor starting problems

There is an issue with the fuel pump.

Consider going for a scan.

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SOURCE: mercedes c180 fuel gauge giving mix reading

You can try to clean the ground behind the instrument cluster to see if that helps but most likely the sending unit has gone bad in the gas tank.

SOURCE: A 1996 C180 mercedes petrol manual, the car wont

check conections on starter motor

SOURCE: i have a mercedes benz

sending unit is in top of tank. common Benz issue and if you have proper tools it's not a hard fix. You have to access tank and replace sender and float assembly. Kind of tricky getting unit back in, lots of twisting and turning to get float & arm into tank... that's about the worst of it.