1) Fuel Pressure: Check the fuel pressure to ensure that the engine is getting enough fuel. If the fuel pressure is too low, the engine won't be able to start.
2) Fuel Delivery: Check the fuel lines, fuel filter, and fuel pump to ensure that fuel is being delivered to the engine. If there is a blockage or restriction in the fuel system, the engine won't be able to start.
3) Ignition Timing: Make sure the ignition timing is correct. If the ignition timing is off, the spark will not be delivered at the right time and the engine won't be able to start.
4) Engine Compression: Check the engine compression to make sure that the engine has enough compression to start. If the compression is too low, the engine won't be able to start.
5) Electrical Problems: Check the battery, starter motor, and other electrical components to ensure that they are functioning properly. If there is an electrical problem, the engine won't be able to start.
If you have checked all of these things and the engine still won't start, you may need to have a mechanic diagnose the problem.
