If the crankshaft position sensor fails you still be able to hear the fuel pump prime when you cycle the key in the ignition but it will not run when you crank the engine with the starter and there will be no spark from the ignition coil when cranking.
If the fuel pump relay fails you will not be able to hear the fuel pump prime when you cycle the key in the ignition and you will have spark from the ignition coil when cranking the engine.
The key to isolating the fault is in determining if the engine fails to start due to lack of fuel or lack of spark. This is easily accomplished by carefully spraying a dose of brake cleaner in the airflow sensor plate with the air filter housing removed. If the engine pops off like its trying to start, then youre not getting any or enough fuel to start the engine, hence "fuel delivery problem", such as, possible fuel pump relay faulty.
If the engine doesnt even try to pop off or start after you spray it then you check for spark. The easiest place to check this is at the coil wire in the center of the distributor cap. Twist the connector and then pull up on it to remove it, stick a spark plug in the wire and lay it on the top of the engine, have someone get in the car and crank it over while you watch for ignition sparks at the spark plug. If there is no spark then you have an ignition issue such as crankshaft position sensor faulty or ignition coil faulty. There are easy ways to determine which is at fault.
Note: If you are going to try to diagnose the car, be very careful when handling fuel and ignition components as they can hurt you, badly, and there are many precautionary measures which should be followed.