engine cuts out!

[*]hi everyone new to this and posted my prob in welcome section first:confused: so here goes recently bought an ex police felicia 1.3(mpi)lxi which cuts out after 2-3 mins .there is a quick clicking noise coming from relay/fuse area,and from previous discussions it seems to be the fuel pump relay.here lies my problem i dont know which relay it is and without knowing i cant order new one can anyone help me identify which one?further to this relay was changed and fault is getting worse!!!car goes for couple of minutes then cuts out and wont start till next day then same again,waiting for mechanic to call will let you all know how i got on