So today I decided that I wanted to change the fuel injectors out with some that i bought from ebay that were cleaned and ultrasonically tested. My van has been running fine these past days only a little rough idling probably due to a leaky fuel injector. After we replaced the fuel injectors all 4 of them with the new ones and tried to crank the van it was running but it sounded like it was running on 2-3 cylinders. After it ran for a bit it shut off and wouldnt start at all. Just cranked. I checked the gas and it was full we tried cranking and my mechanic loosend the fuel line at the fuel rail to see if it was getting fuel. It wasnt so he says somehow the fuel pump randomly died? And I put this fuel pump in not too long ago. It was dark out and I tried jumping the connector to see if I could hear the pump and I couldnt. Maybe ill try again but does that make any sense? The fuel pump going just by changing the injectors? My mechanic said that the new fuel injectors probably had more pressure and thats why the fuel pump went? It did run for a few seconds but it was running like it was on 2-3 cylinders.

Any ideas? Where I should start? Im going to try to re check everything but any more ideas on what to check fuses etc would be really helpful. My van was running completely fine before we touched it.