So I was working on my 300zx and one of the injector o-rings were bad, so I had to remove the whole intake plenum. Got all new seals for the fuel rail and fuel injector and put everything back together(All the right ways too). I turn it on and it ran for a little bit but fuel was coming out the exhaust then it shuts off and I try to turn it back on again and then I noticed fuel was leaking under the car and turns out the fuel was coming from the intake and it was only the passenger side leaking fuel from the intake.
I have absolutely no clue what it could be. All line and connections are in the right place cause I know that for a fact. Please someone help!! Most stressful thing right now for me.

 

Check the fuel rail and the connections from the fuel rail to the diaphragms above it. Make sure everything is tight.

 

What diaphram are you talking about?