I have a slight wiff at the moment as well (The car that is ) in between the reg and the rail there is a tiny piece of hose, this is a crazy design and is very dangerous, it's prone to splitting and if it sprays the fuel in the wrong direction you can imagine the results, so this should be checked as a precautionary measure at least!

Yes O rings should leak if perished, again important as a member on heres car went up in flames due to one going, it was a Westfield with a YB.

Escos/4x4 were revised and have a far better design where the reg is screwed to the rail.

Martin