injection lines.

[truckerP]

Installed new injectors and where the line connects to the injector I cant get them to seal up. they have a drip I dont want to over tighten and do damage. Are there supossed to be o-rings on the lines? Under the fitting the ferral on the line does have a little machined ring in it where it looks like an o-rin could go. There were none on any of the lines when I took them off, so I just dont know. The manual doesn't show a close up of this either.

Any advice or knowlage would be greatly appreciated.