Probably the most common reason would be the fuel pump is bad. Squirt a little starting fluid into the air intake and try to start it. If it starts and runs for a moment, it's the fuel pump.
rocker arms wont open valves all the way for proper fuel air mixture
how does it stall if it wont start?
1989 ford F250 Fuel Problems, It cranks but wont start
You are missing fuel or spark.
rpm went to zero cranks but wont start
There are a few reasons why a 1994 Mazda Protege won't start, but does crank. A couple of reasons could be the air flow sensor or a problem in the fuel lines.
Sounds like you have a dead battery.
if i sccidently shorted the battery car wont start but cranks whats wrong ??
chances are to start with the fuel filter if that's not it try the fuel pump
the first thing I would check is, fuel, spark, coil, ignition module
Can be many things. Lack of fuel, or other electrical problem.
engine cranks but wont start means one of these things.. Air, Fuel, Spark, or compression