I have a w212 2013 and I am having the following problem. when I start the vehicle after 20 minutes on the vehicle turns off alone and I go back and turn it on and after a while it goes back and off I had heard that the fuel pump looked a strange sound and decided to check to see, in that process I disconnected The pressure sensor that is on the driver's side and the vehicle has never been turned off again. What could it be, that this is the sensor this or the problem is the pump?

 

Not sure what pressure sensor you mean - a relay? pressure regulator? But if the pump continues to run then I would suspect that it may be ok. Any trouble codes?