So on my fuel rail there is what appears to be some type of connection in fact there is one either side (5.0L)...although it doesnt come apart from what I can see but it does spin. It also has this sprung steel clip that goes over it as if to keep it together...i would upload a pic but im buggered if I know how

worked out how to add a pic...laptop screen was too small

 

 

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All good....got the hot tip from xafalcon in the v8 workshop...its a clip, comes off using a bit of hard cardboard wrapped around and pushed inside.