1994 Renault Laguna fuel pump/immobiliser?

Hi im havin problems with my engine!
originally I suspected the starter motor but the engine is trying to turn over.
the fuel pump now does not make any noise when attempting to start up. The car is a renault clio with a laguna 1.8 rsi engine in. I recently bought this car and have little more info on it.
i just wondered if you could tell me the location of the fuel pump and if you think this is the problem?

also the alarm has been disconnected and reconnected and I wondered if it could be a problem with the immobiliser?
the alarm is a laserline 1992 range I have all the keys and original fob, I just wondered if this could be part of the problem?

i would be grateful for any help or advice you can give.