My Jaguar is a XJ6 3.2 Sov with 103K been well looked after but has just started cutting out and will not start again for a while after this very well. It never happens to me only my partner. It runs very very well with no trouble normally for me. Please help!!!! Matt

When the car won't start. turn ignition switch off . remove gas cap and have someone turn ignition switch on without cranking the engine.listen for a hissing sound that should last for around 3 to 4 seconds, If you don't hear it the most likely problem is the fuel pump. you can further confirm this by checking voltage at the fuel pump by repeating the first step . There should be 12 volt supply for a few seconds when ignition is turned on.If voltage is present and no sound ,replace fuel pump and raplace fuel filter. Fuel pump is in gas tank. this is a very dangerous operation and suggest you bring it to a mechanic.If there is no voltage ,check the electrical plug to fuelpump as to my experience a lot of unsolved intermittent fuel pump problems could be traced to this plug.The other cause could be fuelpump relay or ECU.