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It is very possible that fuel has become varnish. We recently did and engine swap on a newer Fit and it also would not start.
We swapped the fuel rail and injectors from the original engine and it started right up. You might need to replace the rails and injectors along with the regulator. The one we had did smell like paint varnish.
I would also make sure you have a check engine light working in case the main relay decided to fail along with the engine.
I would first make sure you have fuel at the fuel rail
There is a fuel pressure pulsation dampener on the fuel rail. You can loosen it up and then watch for fuel spray when you turn the key on. You should get a blast of fuel for 2 seconds and then also when cranking.
Glad you got it. I was pretty sure that was it after the Fit we had with plugged injectors.
Pleas do not forget to leave some positive feed back.
Have a greast day.