1.4 HDi diesel engine starts for 10 seconds and stops

We haven't been able to solve it for a month, friends. Our vehicle runs for 20 seconds at the first start, and for 5 seconds after that, it stalls. At the time of stalling, it gives a high radiator fluid temperature warning. When we connect it to the computer, it gives a low fuel pressure warning. The procedures performed are: the fuse box was checked, the crank sensor was renewed, the sensor was renewed, the fuel pump was checked, the injectors were checked, the tank and fuel hoses and filters were checked. There is no engine jump, it works properly when it is running, there is no misfire or anything.