Well I went and replaced all the o-rings and caps, and the thing is still leaking.
I used a heavy oil to lube the orings, which may not have worked. One of my injectors was cross threaded. Pissed me off. Need a new one.
I reset the caps on the driver's side, which is the only side leaking, and sprayed off the oil. Let it dry, and I'll check it in the morning.
I have no idea if I've fixed it yet.