ENGINE ROTATES BUT WILL NOT START

Some reasons why the engine rotates but will not start can be:

Fuel tank is empty
Battery is discharged (if engine is turning slowly)
Battery terminal connections loose or corroded
Leaking fuel injectors, faulty fuel pump, fuel pressure regulator
Fuel not reaching carburetor or injectors
Ignition components damp or damaged
Worn, Faulty or incorrectly gapped spark plugs
Broken, loose or disconnected wiring in the starting circuit
Loose distributor is changing ignition timing
Broken, loose or disconnected wires at the ignition coil or faulty coil

To check for an ignition problem:
Check for a spark getting to the spark plugs.
Remove one, ground it to the engine.
Make sure you hold it with a tool that is insulated.
Have someone turn the engine over.
If you get no spark, the problem is with the ingition.

To check for a fuel problem:
Check the fuel pressure at the injectors.
You probably need to have a shop do this for you because
they have the tools.
No pressure or low pressure indicates a fuel problem.
The most likely fuel problem is fuel pump failure.
If you replace the pump, make sure to also replace the
fuel filter and fuel filter seals.