no fuel, bad fuel pump, clogged fuel filter, low fuel pressure, no spark, clogged air filter, weak/bad battery (dirty terminals), no ground path from engine to battery, bad timing, ignition wires connected in the wrong order, low compression, bad rotor, bad distributor cap(carbon tracing ,ect), fouled spark plugs, shorted solenoid, bad holding winding in solenoid, bad ignition coil(bad connection), bad neutral safety switch, bad ignition switch, among others,
Possible, but not likely.
I would get in my other car
Highly unlikely. You could not generate enough amperage to start the engine. Of course with enough batteries connected together in series & parellel it is possible but not practical.
It is possible, would be a odd coincidence.
Any car can start on fire any time. If you tend to smell gas when your around your car it would be in your best interest to have it inspected by a mechanic as soon as possible.
because their piece of junk!
there rusted...there bent....there old...you need to replace them
There are a lot of reasons that a car might not start even if it is getting fuel and spark. It depends what kind of car it is. It could be something as small and simple as a bad starter or solenoid or something as complicated as a stretched timing chain. What are you working with?
There are several reasons why a car would start and then shut off immediately. It could be battery cables, a fuel problem, or even a bad spark plug.
This question is way too broad in range. What does the car do, sounds, possible smells, or anything that the car usually doesn't do except not start.
Yes it is possible to push start a diesel engine vehicle.
Possible bad starter motor or solenoid. Possible locked up motor (did you run it out of oil?) Possible bad ignition switch. Check all the fuses with a test light.