I replaced my spark plugs on my 2013 135i at 52k a few days ago and noticed what I believe is a small fuel leak in my 4th cylinder line.
I've never worked on high pressure lines before so I wanted to post here to get some input / suggestions:
1. What are good ways to diagnose this and next steps? Could it just be I need to tighten that fitting some?
2. I'm having trouble finding just that individual pipe. The dealer is saying they only sell the entire fuel rail system which is a route I really don't want to have to go.