If the o ring injector is pinch you will lose fuel pressure and the car will not start until you step on the gas pedal. Check and see if your Z hold fuel pressure over night. If you don't have fuel pressure gauge then you can disconnect the fuel line that connect to the fuel filter. But becareful cause if there is fuel pressure it will spray out fuel.My Z was not starting right up so I check fuel pressure with the gauge. Turn out to be bad fuel pump check valve after I check all my o rings.