UK Car Repair: car not starting now, intermittent loss, best guess

Question
jaguar 3.2 sport was running ruff had car taken away but will no turn over y can you answer me this prolem dont no what to look for some one think electric fault

Answer
Hi Steve, have you done the basics (test for a spark at the plugs and check for fuel flow?) my best guess is the fuel pump because they go gradually unless burning out, The first sign of a fuel pump fault is an intermittent loss of power usually after about 10 -20 minutes of running, Check for fuel pressur and get back to me and we will go from there - Paul