hey guys

I am after some advise as this is my first Subaru so please excuse the first post being a help me post :( 

I have a 2003 legacy GT B E tune 2twin turbo auto
Engine - ej206d
Model bh5

I have had all the pipes I can see checked and tightened but I still have a really strong smell of fuel when it's cold from the middle/sides of the engine block. I've been told it could be the fuel rail but until they start stripping they can't say for sure?

How big of a job is this? How much time?
What parts will I need? as the guy I bought the car from will supply all parts.
Could it be anything else?

Thanks guys, really worrying  

Is the smell definitely coming from the bay and is there any other running issues ?

As the classic impreza runs 3.5 bar of fuel pressure, so if it was a leak between fuel filter and the last injector, I'd imagine that it would be spraying out and a easy spot (not just dripping ).

Could be charcoal canister /purge system or fuel tank filler neck maybe

defo from engine block, only when cold. no smells under neath or along the body, the smell comes right around the middle of engine