I need some advice. I have a 96 Disco which doesn't start intermittently. It has been at the dealer for a while. They originally claimed it was the inertia switched and changed it ($275). That didn;t work. Now they claim that the fuel pump is bad. They say that there is power and groundand that the motor on it works but that the impeller doesn't turn. This has to be happening only intermittently for this to be the problem. Is this possible? I am not technically knowledgeable. The estimate to replace the fuel pump is over $600 and I don;t want to spend it if I am being duped. Any help is appreciated.