Being a 94 car, I am guessing it is an SPi, and I think Mk1 Leg was asking for the same reason. Lift the bonnet, and in the far right, there is a small black device - it is a fuel cut out switch. If there is a big enough knock, it can pop this switch. This will stop any fuel getting to the injection system. The idea is that in a crash, it cuts the fuel supply and hopefully reduces the risk of a fire etc.
The top of this switch is round. Just push it down, and all should be good to go again. While you are doing it, take a look at the wiring on it - on my old one it had been badly bodged so was really dodgy.
Edit:

This is what your engine bay will look like if you have an SPi. If you look just to the right of the air filter, there are two yellow squares. Just to the right of this, there is a little black thing - just above the silver metal thing (which is your wiper motor). This black thing is your fuel cut out switch and the top of this is what you need to press.
Edited by Black.Ghost, 02 May 2015 - 09:20 PM.