Does the o-ring for the primary injector diffuser sit on of the diffuser or do you slide it over the diffuser so it makes a seal between the diffuser and the iron.

Thank you. I was looking at that diagram the other day and it doesn’t mention any o-rings for the primary diffuser, but it almost looks like there’s one in pic. I guess the o-rings that can with my rebuild kit are meant for the secondary diffusers.

I use ID injectors and billet fuel rails and I removed my diffusers as they are prone to get brittle and break causing engine failure. They aren’t necessary from what I’ve been told so I don’t run them. I was told that the spray pattern of the most modern injectors doesn’t require them.

I am always on the lookout to remove any potential issues that might cause engine failure. If your motor is out and you are replacing with new diffusers you are probably safe from them breaking due to age. I was upgrading my fuel system and didn’t know the age of the diffusers so I removed them. It’s a bit tricky when the engine is together in the car. You don’t want to break one and drop a piece inside.