1998 Other Infiniti Models 6 cyl Four Wheel Drive Automatic 194586 miles

I was driving my truck and it just shut off on me. My dash lights came on i thought it had stalled on me. so i put it in park and tried to start it it wouldnt start. several people stop to help me and my daughter get the truck off to the side of the road. A few men had asked me to try to start it,then they asked how mwnay miles was on the truck they then opened my gas cap and had me turn the key. they couldnt hear the fuel pump running. i got a new fuel pump and a friend of mine had put it on. You can now hear the fuel pump running which we could'nt before and my truck still will not start. It wants to but just wont turn over.. Can you please help me out with this ??