The fuel pump relay is yellow mate. Well it is on a 4x4 saff. If you have got a faulty crank sensor or crank sensor connector the engine ecu wont pick up the signal so then the fuel pump wont prime. Put if it was the crank sensor at fault it wouldnt start. When i first got my cossie i got told to replace the fuel pump relay cause its a common fault and they stop working apparently.