Replaced fuel pump, then car died on a hill after road trip

The truck is probably stalling on rough roads because the fuel pump float is not staying on the surface of the gasoline in the tank. Therefore, it is taking on air and interrupting the flow of fuel temporarily. It may be sticking a little and operating too slowly.
The fuel pump is inside your gas tank but can be removed and replaced by you if you are skilled enough.

Check the accessory drive belt.

Try to clean up the diesel tank, ..it might be needing a full checking of your fuel injection as well.

Have you replaced the fuel filter?

theres nothing wrong with the fuel pump..did you test the mass air floww sensor or have the egr valve replaced..it will save you trouble from keeping your 2002 nissan altima from dying out.

Your inline fuel filter might be clogged and needs changed or your fuel pump is getting ready to go

Sonds like a sensor putting out an error code to shut it down ( like a fatal error code) Prolonged vibrations and heat can make cam sensors, maf, o2 senosr do craz ythings which will actuate a govener and stall your car...could also be you fuel pump causually telling you that "hey im bout to die".I dealership can run a stress test (if you will) to check the longivity of the pump...
Good luck hope this helps :)

Try cleaning the fuel pump filter. Under the seat behind the driver lift the carpet and you will find a round cover with six screws remove the cover. The fuel pump is directly below unscrew the retaining round plate and remove the pump. At the base of the pump is a small filter if it is covered in black muck that's your problem. clean and replace. job takes about 10 mins good luck. please let me know how you got on!

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check your airfilter. your dirt road is killing it much faster than driving it on pavement

If it happens only when it rains it means that water or moisture is getting under the distributor. The distributor needs to be replaced. Good Luck. Let me know how it turns out.