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Yup the injector O rings. Same thing happened to me when I installed Tomei 740's. One of the smaller lower inj. O rings got pinched when they were pressed in. Caused fuel to dump pass the injector once the fuel rail got primed.
Unbolt the enire fuel rail but leave the injectors connected and plugged in. Turn the key on to prime the fuel rail. The injector with the bad O ring should start leaking. You can also isolate the injector by pulling the plugs to see which ones wet. Make sure to lube up the rings before installing the injectors... and press them down while twisting until they snap in.
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