sinbad

i have a seat alhambra 1.9 tdi 2002 .which just cut out when driving,then the glowwlight started flashing on the dash. so i thought the fuel filter might need changing. When i changed the fuel filter i noticed it was empty of diesel. So i replaced the fuel filter and filled it with diesel to prime it, then the car started straight away, but cut out after the diesel and been used from the filter. The problem seems to be there is no power going to the pump in the fuel tank Ive checked the pump with a 12v supply and it works. i'm going to check the relay but don't know which one is for the fuel pump. then i'm going to check it with a meter can anyone tell me what ohms i should be getting from the relay?.