Mercedes Sprinter does not start

I have a 313 CDI sprinter with 180,000 km.comnzo, it took time to start the three days it did not start at all. The starter engine turns perfectly, but does nothing to start. Proven heaters.
What should I check?
Should I use the eter spray?
Any electronic detector?
The pump?

Hi, Juandemar, check the surplus of the injectors, if you have any injector that overflows a lot of diesel, compared to the others, that is the breakdown. The injector has been open and the pressure of the ramp is lost by the surplus, changes that injector. Greetings.

Thank you, Eljota, for help. I have checked the injectors and heater, they are fine. What I detect is a low pressure of the diesel at the exit of the pump, or so it seems to me. How can I make sure? I have also reviewed the diesel ducts to the pump. Do you know any form or site, southern area of ​​Madrid, to read the UCE?

Check in the Osho engine of the engine in the last cylinder there is a feet that resists the return of the oil in which they have a few orins that are cut for that reason it does not lose the pressure to inject

Hello, I suggest that you see the fuel tank sucking that is not covered or puts a driver with direct fuel to the pump and proba, hopefully a hug Dede Argentina