Sorry to take up space here like this, but I had to know.
I got a set of FIC 750's installed in my car about a week ago, and they've JUST started to make this extremely loud hissing noise.
I think it's coming from the second one from the left, but I'm not really sure.
I know that some people heard clicking noises or something from their new injectors, but this hissing noise is the only thing I hear!!!
And then I tried pushing in that injector a little bit, and the noise is not as loud, but still there.
Is there something wrong with this?

 

maybe a torn o-ring causing a leak?

 

Really?
Awwwww...
They were new too... Darn it.