Q: The car won't start without starter fluid, V2500 Suburban Chevrolet

Hello and thank you for your question.
Perform a fuel pressure test. Even though the fuel is pulsing out of the injectors with the engine cranking the fuel pressure could be too low. The system must have a minimum of 12 pounds of fuel pressure to start and run. If there is proper fuel pressure and you have spark to the spark plugs, then check to see if there is any vacuum leaks. If there is 15 hg or more with the engine running, then that is okay, but 19 hg to 21 hg is preferred. When checking vacuum with cranking the engine, hold open the throttle plate with a large screwdriver and check for vacuum. If the vacuum is less than 2 hg, then there is a problem with the vacuum system. If the vacuum is normal and all the readings are checking out to be good, then when you can get the engine running, put an engine cleaner or sea foam into the vacuum system and run the engine at 3,000 rpm. Slowly allow the cleaner to drip into the vacuum system. This will clean out the cylinders and valve train that will cause carbon build up. Carbon build up will prevent the cylinder from getting to the proper temperature by sticking the valve open or keeping the rings from sealing properly. Either or starting fluid will ignite at a higher flash rate than gasoline. If you need assistance in diagnosing your no start situation, then seek out a professional, preferably a professional from Your Mechanic to help you with your starter issue.