On my 3.0 I have leaking injector that refuses to seal. I installed new o-rings, new washers, & new rubber seats on all 3 injectors on that side.
This helped for a few days, and then it re-occurred. I replaced the same parts again on this injector, sprayed all the grime away from the seat, cleaned the fuel rail with alcohol and q-tip. Put it back together and it was fine for a few days and it's leaking again.
This is leaking from the top, like it's not sealed. When I install the injectors, I put gas on the o-rings and make sure the injectors rotate freely in the fuel rail.
Any suggestions are appreciated.
Thanks,
Phil

 

Maybe instead of gas on the oring, put some sort of lubricant. Who knows might not be seating all the way.

 

yes soak them in a lube. I use a teflon lube called engage but wd-40 or any other like it should work fine. good luck

 

Ditto the other similar responses. I, too, always use a lubicant... oh, wait, thinking of something else.
Seriously though, I've always used high temp silicone on my injector seating/sealing rings for durability and seal.

 

I have both silicone spray lubricant and silicone sealer around. Once it quits raining around here, I'll give those a try. By the time I'm done, I'll be an expert at fuel injector removal

Thanks everyone!!