have a kinda problem wit my discovery 2 TD5 , fuse popped for fuse pump so put a new fuse in this fuse melted in a fuse box so i replaced the fuse box pump never worked so get a 2nd hand pump also a new fuel filter & i cant get it to start tried pumping the pedal 5x to prime the fuel etc turn key to start and all it does it turn over and wont start ?