Can't balance commercial Sanke kegs (gas in beer lines)

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Joeywhat

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Having some real problems with my kegerator. I normally only have cornies on tap, and never have any issue with them. This includes the commercial beers that I get filled in my cornies. However I tried putting two sanke commercial kegs on and I kept getting gas in the beer lines, leading to all sorts of foam. I tried cutting the CO2 to both kegs and releasing the pressure over a couple days to try and get the keg pressure to play with my CO2 line pressure, but the issue persists. I had gone so far with one of the kegs that the beer was noticeably flat, so I can't see how the keg pressure is still higher than my line pressure (12 PSI).

Is there anything I'm overlooking here? I don't think it's air as relieving the keg pressure caused the bubbles to stop momentarily, so it seems tied to the keg pressure/outgassing. I'm using stainless 1/4" flare fittings for everything. Standard Sanke taps, Perlick 630 faucets, 3/16" "ultra barrier" tubing (about 7-8 feet for each tap). The Corny kegs still pour great, so it's really a head scratcher for me. I don't remember having this issue the last time I had a kegerator (about 10-12 years ago).
 

Bobby_M

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The black gasket on the bottom of the D coupler, the smaller one that's on the movable center tube, is what keeps gas from mixing with the beer as it comes out of the keg. A nick or tear in that gasket will cause gas in the outgoing beer.
 
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Joeywhat

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After letting it sit for a day or two I did notice that beer was leaking out of the tailpiece, between the tailpiece and the nut. I'm assuming that this is where the issue lies. I tried all the spare gaskets but nothing helped.

I did notice that the barbed tailpieces that came with the coupler had boss on the bottom, about the same thickness as the gasket. The flare tailpieces I bought do not have those, the bottoms are flat. Any chance there's a compatibility issues between my tailpieces and couplers? I would think they would all work together...

Both the couplers are brand new, so I'm having a hard time believing they are both bad. I changed the tailpieces on both to 1/4" flare, but I don't know what other tailpieces would work here...
 
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I've been struggling with my sanke keg adapter lately. I think I finally figured out that I was over tightening the thing. I was getting big ugly bubble foam and it was leaving the beer completely flat. I backed off the twist of the connector to just be tight enough to hold beer and things cleared right up. That inner rubber gasket on mine was getting too squished I think. Thanks for the clues that led me to the problem!
 

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