Leaking inverted flare connection

[sailorgp]

Has anyone heard of using soft copper washers to eliminate leaks on flared fittings? Copper washers are used inside flared fittings in the refrigeration industry. The reason I ask is because I'm having problems with the fuel inlet connection on my qjet.

[jamesF]

Yes. I used them in my 1/2" stainless fuel line. There was  one connection that I just couldn't get to stop seeping no matter how often I worked it. Maybe because I have a 220GPH pump in the tank so it is going to find a leak more likely than if I was running a stock mechanical pump.
I bought mine here:
https://haywardsupply.com/pages/search-results?type=product&q=COPPER+FLARE+GASKET
Search for Flare Bonnets. or Flare washers

[77cruiser]

If you try it & it works great but don't rule out a crack in the seam of the tubing at the flare.

[von]

Yes I've used them successfully on a Holley.

[RonA]

I think if you put a small coating of moly paste or some other lube on the back of the flare and nut you will probably get another 1/4 turn. Sometimes the two bind if dry and feel tight.

[sailorgp]

Thank you all for the hints/tips. I'm picking up some 3/8" flared copper washers from Grainger later today. Before using one I will try and work (tighten/loosen/tighten/loosen) the fittings one more time before going the washer route. I've already lubed it and even used a magnifying glass to inspect for cracks or nicks in the mating surfaces.
This is a boat engine I'm working on so I need to be 110% sure there are no leaks.
Kurt