Leaking AN fittings

[DonC]

Photo is too dark for me to see inside the nose but my vote for the culprit would be the pipe to AN fittings. Largely dependent on the mating surface angle of the male and female sides of the coupling. If one of them is a "bit off" they won't seal properly. The other area of possible problem is cross threading when assembling or debris around the shoulder of the female ferule.

DonC

[mikeinatlanta]

The pic doesn't show anything. Are you certain the leak is from the AN fitting? Everything I'm writing is if it is in fact the AN leaking.

The primary culprit for leaking AN fittings is attempting to force a misaligned fitting into place by wrenching on it. When properly aligned, you can run the nut almost all the way down using your fingers. When you force it down with a wrench it will tend to leak. When you attempt to correct the leak by over-torqueing the fitting you can cause permanent damage.

First step is to examine the male for obvious deformation and the female for a crack.

Reinstall the fitting with it properly aligned such that you can run the nut all the way down with your fingers.

Tighten to the proper torque for the fitting size. Do not over-torque.

If the fitting is undamaged, this will correct the issue. If there is some sealing surface deformation it will not.

If the fitting continues to leak, reassemble with a 37 degree conical sealing washer. If the leak continues, you most likely have cracked the female fitting.

[jhv48]

Conical sealing washer did it for me too.

I think I got them from either Jegs or Summit. Made by Earl's. Cost about $10.