Hi mate,

Take a look at the inlet side. The injector rail is the stainless steel thing sitting on top of the injectors. On the end of this (close to the front of the engine bay, you will see a thing that looks like a small barrel (very small), which has a fuel pipe (return) coming out of the bottom of it (don't touch this!), and a air line coming into it horizontally at high level.

The air lines are pretty easy to identify. Dont get the fuel lines confused though!

If you didnt install the boost gauge, the pipe that looks like it is leading away from the engine to the rear will be the one you are looking for. (ie towards the cockpit). Also check pipe to top of dump valve.

JJ