Small Engines (Lawn Mowers, etc.): 15.5 murray ohv briggs i/c engine, fuel tank cap, water in the fuel

Question
Mower won't start. cranks over, has spark, cleaned plug pored gas in carb even hit with shot of either still nothing.

Answer
John

Problem: Engine will not start or is hard to start.
Possible causes:

Fuel tank is empty or shutoff valve is closed, or fuel line or fuel tank cap vent is clogged.
There is water in the fuel.
Carburetor is overchoked.
Carburetor is improperly adjusted or needs service.
Ignition system or its wiring is defective or ignition switch is off.
Deadman or other cutoff switch is open or defective.
Spark plug is fouled, improperly gapped, or damaged.
Engine compression is poor.