hi my name is Greg I have a 2005 nissan patrol it has Z D 30 not common rail fuel system I am having trouble starting the car 1 I took it to nissan and they told me it was the primary pump so I replaced it with a new one still the same hard to start2 took to another diesel place told me it was the filter ryco so I changed it to a Jap filter no different so took to a diesel work shop for a diagnostic came back all test ok no air before primary pump or after so I was told it was the injector pump so$ 6000.00 later still the same It appears that it looses fuel pressure if left standing for any period of time like over night I am at a loss at what to do next regards Greg