why I don't have spark

Hello, did you previously have no fuel, and that is now resolved? What was the purpose of replacing those fuel system components? I'm sorry to say that there are dozens of possible causes why you would not get ignition spark. Hands on testing is the only way to figure out what is going on here. A skilled, trained and experienced technician familiar with Mercedes-Benz vehicle diagnostic testing and repairs equipped with necessary test equipment is needed. www.repairpal.com/repair-shops