Eager ****** wont start, sprayed engine starter fluid, but shuts off from lack of fuel?

What's the fuel pressure ? Do a fuel pressure an leak down test . When do you need to use starting fluid in the morning after the vehicle sit's over night ? All the time ? Speed sensor has nothing to do with this . A bad speed sensor would cause transmission shifting problem's , Speedometer not working , engine would not run right etc.... There is a check valve in the fuel pump to keep pressure in the fuel lines ,fuel rail . Sounds like check valve is bad , letting fuel drain back into the tank .

to remove contaminated fuel , pull a fuel line of the fuel manifold and run the pump for a few seconds
not firing is sensor , immobilizer , ignition module problem but you stat that it fires on starter fluid so that cannot be right
starter fluid is a d good way of damaging the engine
a better way is to find and fix the fault
now to try and sort out what you are saying
it is cranking so the starter is good
it tries to run on starter fluid so there is spark to the plugs
it will not run and that indicates a lack of fuel to the injectors
a lack of fuel indicates
1--- a bad fuel pump
2--a vacuum in ht e fuel system from the tank not venting properly(EVAP system)
3--- fuel pressure regulator not working and providing pressure to the injectors
4--- bad injectors --- need cleaning
dump the starter fluid , buy a workshop manual and fix the problem properly

It would greatly help to know make, model, and year, but in general you check fuel pump pressure with a gauge, and if the pump is electric, it always has a relay so there is the ability to have a safety cut out. Some vehicles use lack of oil pressure to cut out the pump relay, but most use the alternator output. Fuel injection usually has from 20 to 40 psi fuel pressure, and carb systems from 3 to 10 psi.

if it was the fuel pump engine should start with starter spray at least for a second or two, so, it sounds like your fuel pump is bad.
turn ignition to run and try hearing the pump run.

make sure you have fuel pressure first

Three things cause an engine not to start. Lack of fuel, Lack of spark ( ignition ) and lack of compression. If you spray a little starting fluid into the aircleaner and it starts and theen quits, then you know it is a fuel problem if it won't start on starting fluid then it may be electrical. I am assuming the compression is good. If it was not then your engine would sound like a sewing machine when turning over. If it is electrical, there are quite a number of culprits, if it is fuel related suspect the pump or the power supply to the pump.

one answer is lack of compression in the cylinders,normally associated with high miles.
could also be valve seats/spark plug gap/dirty air filter,there are a few more but start with the cheapest to diagnose and work up.....

Check your fuel filter, fuel regulator, and fuel pump. It sounds like you are starving the engine of fuel.

yes it is very likely it is a fuel pump sticking, to verify this buy a can of spray starter fluid, next time it won't start spray the starter fluid into theintake air hose on the engine, if it starts and then quickly shuts down u need a fuel pump, also replace the filter.

Have you changed the fuel filter? Did it die while driving, or just wouldn't start? Don't use starting fluid on a gas engine! It will cause a lot more problems than it solves. Ether, starting fluid is made for diesel engines... not gas, not ever. If it won't start, it isn't lacking ether. It's lacking gas, air or spark.