>       I have no idea what the 90- degree pipe is on your injectors.
Never
> saw
> one like that before.
I have seen the same
> type
> injectors with the 90 degree returns on an IO360 Lycoming a friend of
mine
> has.  If you like, I can take a picture of one.
You were looking at the shrouded fuel injector bodies that reference
"deck pressure" thru manifold lines, which means the injector ambient
pressure around it is equal to the boosted pressure. That's the way
Lycoming does injected engines.
[Marc Wiese]