03 gtp, 142k mi.

I changed my fuel injector o-rings w/ fel-pro, mainly b/c I need to change my valve cover gaskets. When I finished tightening everything down, I re-installed gas cap, fuel pump fuse, & negative battery cable. Turn ignition to ON, & gas shoots out of top of injector #1 where it enters the rail. Shoots like a drinking fountain with your thumb over it.

What did I break?

Advice. is greatly appreciated. Thanks.