My S4 cut out on me on Saturday morning, all the ignition lights are still active and no warning light came on prior to the engine cutting out, the recovery guy stuck his head underneath the fuel tank and said he couldnt hear the fuel pump running when i cranked it over, the same thing happened a few weeks back but after about 10 mins the car started again and was fine, this time however i had to be towed home and have still not been able to start the car. anyone had a similar problem or have any ideas? fuel pump relay i'm guessing would b the place to start but no have idea which one it is??