are you talking about the injector hat that holds the injector down with two bolts
or
the little finger that sticks out the top of the injector, i presume if its there, it needs to be there.
Is it the little bit that looks like a pin head going in from the top in the centre??? If it is id imagine it could be a leak off connection??? Could be wrong
If you can get a picture up and someone should definatly know
Taking the injectors caps off... hmmmmmmmmm.. that would be interesting, try to give your local Fire station some notice of when you intend doing so... Prodigy, "im the fire starter" comes to mind