How does one disconnect the fuel return line from the back end of a fuel rail 2.2L VIN 4 SFI

1999 CHEVROLET S-10
126,000 MILES
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WILLEZURMACHT
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I am removing the intake manifold and need to detach the fuel return, I backed off a large threaded cap and there is a black
plastic ring but I don't see any kind of release or coupling, the supply end had a quick couple which I released.
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Dec 31, 2011 at 12:45 AM
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