Engine stall New holland E385

I have a New Holland E385 year 2006. It starts good and has good power, then after one hour engine start to stall on load and even shut down. I already changed injectors, but didn't input numbers on the ECU. Could this be the problem or is it the main fuel pump plunger or solenoid? By the way it has an isuzu AH-6HK engine. Is there any way to test rail pressure on the monitor or to do a quick diagnose, thank you

Engine stall New holland E385