2004 Nissan Maxima 3.5L, the car ran out of gas, I put some gas, the car did not start, I sprayed some starter fluid but the car still won't start. What could the problem be?

Remove the air intake from the air filter container to the throttle body. Use only a quick shot of starting fluid. Can you hear the fuel pump run? Power cycling the key should get fuel flowing and is safer than starting fluid.

Sometimes it takes awhile to prime itself trying again never hurt. the other thing that is possible is that the tank bottom had contaminates in it which were sucked up into the line when it was so low. these can get caught anywhere in the fuel line. I would get a new fuel filter(good to change anyways) the debris or contaminates would likely get trapped there where it is suppose too. it could have stopped it up. if you dont have the 10 -20 bucks for a new filter you can still pull it and try to free the debris by rinsing it with gas the opposite way and reuse. worse case scenario you may need a new fuel pump.. could have burned it up. it happens.. or the debris was large enough to stop it up. either way it sucks because replacing them are never fun. good luck

make sure you have fuel pressure first

spray aero start into the intake as someone is cranking the motor. If it runs on aero start it is a fuel delivery / pressure problem

Check the transmission fluid level using the dipstick located under the hood and near the front of the transmission. The car should be at operating temperature, running and in nuetral. If the level is low ask the auto part store to sell you the correct type of fluid. It does matter.

could be a fuel pump. hammer on the gas tank and see if it tries to start. if not then spray carb cleaner or starting fluid into the air intake and see if it starts and runs for a few seconds if so your looking at a bad fuel pump most likely.

if you put up your hood of car and have someone in the car to try to start it and another person outside listening to the engine while you try to start the car should have a clicking sound from the starter try to help turn over the engine but if you do not hear this then check your starter and might have to take it out and replaced. The starter is the first thing to check out for sure.

First, did you try pumping the gas pedal and starting the car? It may take a few minutes since the fuel lines need to be pressurized again.
If this still doesn't work, your fuel pump may have died. Fuel in the tank helps to keep the fuel pump from overheating and failing. Have your fuel pressure tested and check/replace the fuel pump. Have you tried gas or starter fluid in air induction system? you only need a couple teaspoons of gas or short squirt of starting fluid. When you "crank engine' it will start up and give a "short burst of power", as the available fuel is burned! If this happens, you definitely have a fuel problem, most likely leading to the fuel pump.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

make sure that all the wires are are back in place on the starter?
maybe one was left loose , if it ran ok before the starter
replacement.

Check your ignition switch and it may be worn ....^_~