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Fuel injectors spray a mist into the cylinder, the O-rings ensure all of the fuel spray into the clyinder. Your fuel rail is pressurized around 50 psi or so when the rings fail it will send that spray out of the head and onto the intake manifold and catch fire. That can be bad.
well about 30 min to get everything bolted back up. primed the fuel pump a bunch be fore i started an no leak. started it up twice and no leaks. so i think i fixed it! thanks billy and user for the tips.