P0455 EVAP leak
 

I've read a few threads on this, but my case is that I was going to install nitrous in my car. But I never went through with it, but I had already tapped my fuel line. I got a CEL for the large evap system leak, which I expected because when I first tapped it, it was not sealed all the way. But ever since then the CEL hasn't turned off, I replaced the fuel line where I tapped but the CEL never turned off whether I clear it or not. I'm just questioning whether I installed the new fuel line correctly or not... I just snapped it on very simply, do I need to put some sort of glue or something to seal the connections?

might be a dumb question, but i can't figure this out.

help? anyone?