Hi My 2002 HDI has been perfect for the past 6 months. But noticed over the past week or so when I put key in ignition and before the starter turns the fuel pump sounded rough. Yesterday took nearly 10 minutes before it would start and this morning no start. Noticed could not hear any priming sound so would assume the lift pump has stopped working. Due to previous noisy priming, I would assume need new pump. Is the pump in the tank and how easy is it to get to and change, any special precautions in the change Thanks