My truck has 200K miles. All of a sudden while driving in city 35 pmh It

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Spudders and dies. Dash lights are on but put it in neutral coasting try and start it with no luck. Belt is intact. I've changed the fuel pump relay bad pump. Still not starting. Turns over spudders backfires but never starts. Baught a computer reader for 96 or newer but nothing is codeing bad. But the fuel pump is not completing the self test. I need some possible advice in getting it running again.