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I had a something similar to this happen to a girlfriend of mine. She has a 98 escort and it ran out of gas and the service engine soon light came on after she filled it up. If this is what your talking about check your owners manual. Most of the time if there is really nothing wrong with car you can drive it around ( Generally 20 min in town and 10 on the hwy with 4 idle periods (4 times of the engine being at idle) - do not cut engine off) and the light will go off. The rough idle code most likely happened when the engine ran roughly because. it was running out of gas.
Ok so there is residual pressure in the pump to give to crank but no run.
Pump is your problem. The fuel pump has to prime the injectors ( residual pressure) and then continune to supply fuel to run the vehicle( Pump Pressure) .Pressure regulator increases or decreases pressure depending upon the load and temp conditions.The only this that is missing is the relay, but thats not your problem cause if it was the vehicle would not crank.