Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question,If you are sure sugar has been added to the fuel tank, You do not want to drive the car at all. Do not even start it. Sugar will destroy the engine if left in the fuel. It will ruin your injectors and cause your valves to stick. You are going to need to have the fuel tank removed and thoroughly cleaned as well as the fuel lines and injectors if its been ran and you will also need to change the fuel filter. Post back if you have more questions and or need more help and we can work from there.
You may also need to replace the fuel pump. Sugar is very damaging to the whole system.