You have a pump in the tank, this could be fubar, i don't know how petrols on Landys work, but you must have a feed pipe some place, pull it out get someone to turn the engine and petrol should come poring out, if it isn't then your not getting it pumped up and there lays your problem, like i say if it was a diesel i would know where it come from or to, if you have (like on the diesel) pipes going in to the injectors, you can pull them off and get someone to turn the engine and see if the fuel comes out