AN fitting oil leak

phunk

You should be able to isolate it if you break it down and consider each individual sealing point.

You have your tapered threads into the sandwich plate, which require thread sealant to seal. You look dry there.

Next out, you have the 37 degree AN flare seals. It appears, at least from the one photo, that your top fitting flare is leaking. This type of seal is formed by forcing a male and female 37 degree flange against one another. The only way they leak is if flare surface is damaged, or if something is in there preventing the flares from seating against each other. I suppose its also possible to have a manufacturing deflect like perhaps the flare is at the incorrect angle, but I would suggest this is highly unlike. If the flare seats are in good condition and there is no debris in there, it probably just needs to be tighter.

Next out from there, you have swivel ends (so you can twist the hose on the fitting for easier installation and routing). These seal with an internal oring. Its possible that the top swivel is leaking and its running down the pipe to the flare nut, hard to tell in the picture.

The next point for a leak is the hose barb... I am going to assume the hose is all the way in the nut and the the barb is sealing on the hose.

Next time, I would personally use non-swivel hose ends, since its just adding one more area for a potential leak just for a very minor convenience. But in the picture, it doesn't look like the swivel is leaking, but that the flare is.

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