Many years ago when I was a child my mother used to go around our garden with a little tin shovel and flick the dog dirt over the hedge into the road. It was usually an ex-coal shovel that had been demoted to dog dirt duties. One day she hit a...

Another thing that's fairly quick and easy to do is check that the power to the pump is switching on when it should. There's a wire from the ECU which becomes live when the ignition is switched on that trips one of the yellow relays under the...