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don't try to reuse those o rings, they are cheap. I removed a fuel rail before without the forethought to order them first. I did succeed but I cursed myself since they are only about a dollar each or so.. I'd oil them too.
I read that a trick to see if they leak is to oil them after install, see if the oil gets sucked in.
I was initially kind of half-thinking that they had to stand the compression, but I think the intake valves are closed when the cylinders compress so ( I think? ) that isolates them from the compression stroke?
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