Ok guys so I just rebuilt my engine (S6) and while rebuilding it I broke 2 of the primary fuel diffusers. My first question is are they needed or can I delete them all together primary and secondaries? My second question is do I need to run the o-rings with my new injectors? I'm running bosh EV14 top feeds, it seems like they seal without the o-rings and with them they are super tight I haven't even gotten them to seat. Any help would be awesome as this is my first build.

 

I've seen most people delete them when going with top feed injectors(like the ev14's). They are there to help atomize the fuel. As long as you can get a good seal they are not required with aftermarket injectors.

 

You don't need them for EV14, what rail are you using? FFE and CJM both sells lower O-ring inserts for their rails, which includes o-ringed sleeves and injector O-rings.

 

Awesome ok I'm using the FFE rails as well