Ok so here's what's going on. Upgraded injectors fic1000, and upgraded to Holley return less fuel rails. They leak when you turn the key to prime them. Put the spacers on the rails to fit the taller injectors and used vasoline per fuel injector connections instructions. New o rings and just about everything else you could think of. Here's the crazy part, if you put the stock rail on, no leaking at all. What gives? It on a 2011 GMC Sierra 4.8 with a 76mm turbo. Holley part number 532-209. Any of you guys run into this?

 

Probably needs different injector o-rings.

 

Tried two different sets