I have the primary rail from kgparts and 1000cc/min primary injectors from the rx7store. I just finished my car tonight and when i went to start it, it was spraying fuel from the rear injector on the primary rail. i have brand new o rings on the top and bottom of the injectors and the rx7store spacers on the bottom of the injectors. is there a possibility that the rail just wasnt tightened down enough to the center iron??

 

it has to be directly over top or it will leak.
when i took my car up to the rx-7store they kinda fought with my fuel system,
install, check, leak.
reinstall check, leak.
till finally they got it.

so straight up and down.

 

That rail is a huge PITA. Spray the o-rings with some wd40 and get both injector tops started in the port. Next apply some leaning pressure to make sure they go all the way down the ports. Then tighten those allen head bolts. I still think the rail is milled with the port holes too closely together.
Just before you put everything back together have all the lines hooked up with the UIM off and prime the system several times. Confirm no leaks then put it all together.