I have just been through my car trying to fix a similar problem. I had driven 500km the other week and not a single problem, get home after 28km along a dusty track and leave it outside for a while. Now it does not start after turning over and over again.
Fuel pump = fine
Fuel relay = fine
But tested the connections and there is no power getting to the relay or the pump. Perhaps there is a problem with the wiring on the bottom of the car where it enters under the passenger seat. This is my next task; to see if the dust has affected the wire underneath.
Does anyone have an idea to what could be causing this problem other than a wire issue? (Speaking to a man today, he thinks that the onboard computer could be confusing itself due to the battery going flat and then being recharged)
much appreciated
Harry