Hello,
An engine only needs three things and then it pretty much has to start. In no particular order they are fuel, spark [delivered at the proper time], and compression. If you have verified that there is fuel pressure at the fuel rail and the fuel injectors are firing, and there is spark at the spark plugs, then the only thing that would stop the engine from starting would be the engine's compression, or lack there of. In the diagrams down below I have included a link to a guide describing how to do a compression test.
https://www.2carpros.com/articles/how-to-test-engine-compression
Please go through this guide and get back to us with the results. We can go from there.
Thanks,
Alex
2CarPros
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Thursday, January 16th, 2020 AT 8:50 PM