My 2002 XJ8 Exec. has just developed a starting fault which the AA said was due to the fuel pump failing. The replacement job looks very daunting, so, I would really like to be sure that the problem is correctly diagnosed. It began with the engine turning over but not firing, then the key fob wouldn't work at all, and presumably, not set or or disable the alarm. I'm wondering if anyone had advice on replacing the fuel pump or how to check the alarm system. Does a fault on the alarm turn off the fuel pump?