Hi.

At the first I would like to say that my problem is common for cars with petrol and diesel engines. The problem is the following:

I know when I put the key on ignition ( before starting the engine ) the electric fuel pump ( which is in fuel tank ) should work ( for a short time ) to supply the fuel to engine. It doesn't work. What could be the reason? I have measured the voltage on fuse N23 ( the pump's fuse. The fuse was OK ) and there was not a voltage when I switched on the key on ignition state. The relay which supplies the voltage to that fuse also was OK. I think that from a reason (I would like to know WHAT reason ) the DDE doesn't send signal to mentioned relay. Maybe by the some reason there is insufficient pressure in fuel supply system? Maybe the fuel level sensor is responsible for the mentioned signal?
My thanks to everybody who will reply to my issue.
P.S.
Just when I start the starter the pump works. But it also should work before starting the starter, when the key has put on ignition state.