Car run if you aplicate gas on or starter fuid only we check fuel pump and relay look to be fine 2005 sentra 1.8

https://www.google.com/search?q=2005+nissan+sentra+1.8+starter+relay

and

https://fuse-box.info/nissan/nissan-sentra-b15-2000-2006-fuses-and-relays

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try this link copy and paste
https://www.justanswer.com/nissan/25u4e-need-know-location-fuel-pump-relay-03-sentra.html

fuel pump has a check valve to stop fuel from draining back, could be the problem

I would check for heat damaged fuel pump connectors and also replace the fuel pump relay.

Check the starter fuse and the emergency fuel cut off switch located in passenger kickboard area. PUSH BUTTON to reset

Well you have to check the fuse and relay for the fuel pump,if they are good,then you need to take the fuel pump out to test it,there are 2 wires that goes in 1 positive and 1 negative so connect it to the battery to see if the pump is still good or not.

Check all fuses then replace the fuel pump relay.

The car is running and will shut off by itself. This is a usual symptom of a fault in the fuel system. A number of reasons contribute to this 1) there is no fuel or wrong fuel type, 2) dirty fuel filter, and 3) the fuel pump is failing.

From the description you provided, a drop in power means not enough fuel is injected to be burned by the system. This points towards a failing fuel pump.

Have this checked out by a qualified technician if you are unable to do it yourself.

Hope this helps.

this is a symptom of a bad fuel pump, replace it. The fuel pump is located inside the gas tank.

are you getting a spark on your spark plug????/