Can anybody please help? I have a 95 4.3 vortec w vin. The problem started one morning when I went to start it up, when i did that the gas opened up all the way so I just shut it off. Someone told me that the injector could maybe have something to do with it, so I replaced the injector and the nut kit as well. I put everything back together, started it up and all it did was backfire a couple of times and then die and now it will not start at all, does anybody have any suggestions to throw at me?

 

Fuel pump?

Any codes thrown?

 

I can hear the fuel pump go on when i turn the key on and its not throwing any codes