It could be something as simple as the fuel filter.
Pressure - how much? I don't understand the "power" bit! 'Fine' is not good enough!jag man had done all sorts of test and said the pumps fine as there is power and pressure from it
What does the relay do? There is no electric pump on the diesel x-type, there is only a mechanical pump driven directly from the engine.theres a relay for the 2.0 diesel x type jaguar under the battery tray for the diesel pump